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 A275875 #5 Aug 14 2016 23:24:00 %S A275875 2,1,3,1,2,3,1,1,2,4,1,1,2,2,4,1,1,1,2,3,4,1,1,1,2,2,3,4,1,1,1,1,2,2, %T A275875 3,5,1,1,1,1,2,2,2,3,5,1,1,1,1,1,2,2,3,3,5 %N A275875 Subadditive triangle read by rows associated with the Grundy function A025480. %C A275875 See Levine 2004/2006 for definition. His Theorem 3.6 shows that there is a one-to-one correspondence between fractal sequences and subadditive triangles. %D A275875 L. Levine, Fractal sequences and restricted Nim, Ars Combin. 80 (2006), 113-127. %H A275875 L. Levine, <a href="http://arXiv.org/abs/math.CO/0409408">Fractal sequences and restricted Nim</a>, arXiv:math/0409408 [math.CO], 2004. %e A275875 Triangle begins: %e A275875 2, %e A275875 1,3, %e A275875 1,2,3, %e A275875 1,1,2,4, %e A275875 1,1,2,2,4, %e A275875 1,1,1,2,3,4, %e A275875 1,1,1,2,2,3,4, %e A275875 1,1,1,1,2,2,3,5, %e A275875 1,1,1,1,2,2,2,3,5, %e A275875 1,1,1,1,1,2,2,3,3,5, %e A275875 ... %Y A275875 Cf. A025480. %K A275875 nonn,tabl,more %O A275875 0,1 %A A275875 _N. J. A. Sloane_, Aug 14 2016