Another curious puzzle and number sequence from Neil Sloane. More of our videos with Neil: http://bit.ly/Sloane_Numberphile More links & stuff in full description below ↓↓↓ Neil Sloane is founder of the On-Line Encyclopedia of Integer Sequences: https://oeis.org/ More of our videos with Neil Sloane: http://bit.ly/Sloane_Numberphile Pebbling a chessboard with Zvezda Stankova: https://www.youtube.com/watch?v=lFQGSGsXbXE Patreon: http://www.patreon.com/numberphile Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. https://www.simonsfoundation.org/outreach/science-sandbox/ And support from The Akamai Foundation - dedicated to encouraging the next generation of technology innovators and equitable access to STEM education - https://www.akamai.com/company/corporate-responsibility/akamai-foundation NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Numberphile T-Shirts and Merch: null Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9 Thanks to all our Patreon supporters, including: Ben Delo Juan Benet Jeff Straathof Ken Baron Yana Chernobilsky Andy B Michael Dunworth James Bissonette Jubal John Jeremy Buchanan Steve Crutchfield Adam Savage Ben White Andrei M Burke RAD Donato Matthew Schuster Nat Tyce Ron Hochsprung Ubiquity Ventures John Zelinka Gnare Kannan Stanz OnlineBookClub.org Tracy Parry Ian George Walker Arnas Bernd Sing Valentin Alfred Wallace Charles Southerland Bodhisattva Debnath Alex Khein Kermit Norlund Mirik Gogri Doug Hoffman Xavier F. G. Avi Yashchin