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 A211313 #15 Feb 09 2019 07:25:01 %S A211313 1,1,1,1,3,1,1,0,0,1,1,2,3,2,1,1,4,0,0,4,1,1,1,1,3,1,1,1,1,3,1,4,4,1, %T A211313 3,1,1,0,0,1,1,1,0,0,1,1,2,3,2,1,1,2,3,2,1,1,4,0,0,4,3,4,0,0,4,1,1,1, %U A211313 1,3,1,3,3,1,3,1,1,1,1,3,1,4,4,3,4,3,4,4,1,3,1 %N A211313 Square array of Delannoy numbers D(i,j) mod 5 (i >= 0, j >= 0) read by antidiagonals. %H A211313 Marko Razpet, <a href="http://dx.doi.org/10.1016/S0012-365X(01)00098-X">A self-similarity structure generated by king's walk</a>, Algebraic and topological methods in graph theory (Lake Bled, 1999). Discrete Math. 244 (2002), no. 1-3, 423--433. MR1844050 (2002k:05022). %H A211313 Rémy Sigrist, <a href="/A211313/a211313.png">Colored representation of the first 1000 rows</a> %e A211313 Written as a triangle: %e A211313 1, %e A211313 1, 1, %e A211313 1, 3, 1, %e A211313 1, 0, 0, 1, %e A211313 1, 2, 3, 2, 1, %e A211313 1, 4, 0, 0, 4, 1, %e A211313 1, 1, 1, 3, 1, 1, 1, %e A211313 1, 3, 1, 4, 4, 1, 3, 1, %e A211313 1, 0, 0, 1, 1, 1, 0, 0, 1, %e A211313 ... %Y A211313 Cf. A008288, A211312, A211314, A211315. %K A211313 nonn,tabl %O A211313 0,5 %A A211313 _N. J. A. Sloane_, Apr 15 2012