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 A274618 #4 Jul 02 2016 10:52:26 %S A274618 0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,3,3,2,2,8,8,9,9,7,7,6,6,5,5,4,4,3,3, %T A274618 2,2,8,8,9,9,4,4,5,5,12,12,13,13,9,9,8,8,2,2,3,3,4,4,5,5,15,15,14,14, %U A274618 3,3,2,2,8,8,9,9,7,7,6,6,5,5,4,4 %N A274618 Sprague-Grundy values for the game of duplicate Double Kayles (octal game .07DDDD7). %D A274618 Guy, R. K. and Smith, C. A. B.; The G-values of various games. Proc. Cambridge Philos. Soc. 52 (1956), 514-526. See page 521. %H A274618 Ultimately periodic with period 48 (see A071074). %Y A274618 This is A071074 with every term repeated. %K A274618 nonn %O A274618 0,5 %A A274618 _N. J. A. Sloane_, Jul 02 2016