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 A307281 #25 Jun 30 2019 14:48:51 %S A307281 0,3,6,1,5,4,2,10,13,16,7,19,18,8,23,26,9,29,12,11,30,34,37,14,40,39, %T A307281 15,44,47,17,20,49,52,55,21,58,57,22,62,25,24,66,69,72,27,71,74,28,78, %U A307281 31,81,84,32,87,86,33,91,36,35,95,98,101,38,100,103,106,41 %N A307281 a(n) = second coordinate m of P-position (n,m) in Maharaja Nim. %C A307281 This is a self-inverse permutation of the nonnegative numbers. %H A307281 Rémy Sigrist, <a href="/A307281/b307281.txt">Table of n, a(n) for n = 0..10000</a> %H A307281 Urban Larsson and Johan Wastlund, <a href="https://arxiv.org/abs/1207.0765">Maharaja Nim: Wythoff’s Queen meets the Knight</a>, arXiv 1207.0765 [math.CO], 2012. [See Fig. 2 (right).] %H A307281 Urban Larsson and Johan Wästlund, <a href="https://www.emis.de/journals/INTEGERS/papers/og5/og5.Abstract.html">Maharaja Nim: Wythoff’s Queen meets the Knight</a>, Integers: Electronic Journal of Combinatorial Number Theory 14 (2014), #G05. [See Fig. 2 (right).] %H A307281 Rémy Sigrist, <a href="/A307281/a307281.txt">C program for A307281</a> %H A307281 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %p A307281 Larsson and Wastlund give Maple code. %o A307281 (C) See Links section. %Y A307281 See A308201 for Sprague-Grundy values (the present sequence focuses on the 0 values in that table). %Y A307281 See A000201 and A001950 for Wythoff's Nim. %K A307281 nonn %O A307281 0,2 %A A307281 _N. J. A. Sloane_, Apr 05 2019 %E A307281 Data corrected by _Rémy Sigrist_, Apr 18 2019