This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A286332 #18 Jul 06 2020 17:36:02 %S A286332 0,2,2,1,4,3,3,1,4,2,6,5,0,2,7,1,4,3,3,1,4,7,7,5,0,2,8,4,4,6,3,1,8,7, %T A286332 7,5,0,2,2,1,4,6,3,1,8,2,7,5,0,2,8,1,4,6,3,1,4,2,7,5,0,2,8,1,4,6,3,1, %U A286332 8,7,7,5,0,2,8,1,4,6,3,1,8,2,7,5,0,2,8,1,4,6,3,1,8,2,7,5 %N A286332 Grundy values for 2 X n rectangles in Remove-a-Square game. %C A286332 Given a 2 X n rectangle on a square grid, players are allowed to remove one cell or a 2 X 2 full square. %C A286332 a(12n+1) = 0. %C A286332 The sequence becomes eventually periodic with period 12. %H A286332 Pratik Alladi, Neel Bhalla, Tanya Khovanova, Nathan Sheffield, Eddie Song, William Sun, Andrew The, Alan Wang, Naor Wiesel, Kevin Zhang Kevin Zhao, <a href="https://arxiv.org/abs/1707.07201">PRIMES STEP Plays Games</a>, arXiv:1707.07201 [math.CO], 2017, Section 7. %H A286332 Sierra Brown, Spencer Daugherty, Eugene Fiorini, Barbara Maldonado, Diego Manzano-Ruiz, Sean Rainville, Riley Waechter, and Tony W. H. Wong, <a href="https://cs.uwaterloo.ca/journals/JIS/VOL23/Wong/wong24.html">Nimber Sequences of Node-Kayles Games</a>, J. Int. Seq., Vol. 23 (2020), Article 20.3.5. %K A286332 nonn %O A286332 1,2 %A A286332 _Tanya Khovanova_ and students, May 07 2017