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 A286418 #13 Feb 16 2025 08:33:45 %S A286418 0,0,0,1,1,1,7,14,14,7,37,170,312,170,37,197,2904,13945,13945,2904, %T A286418 197,1172,74779,1241696,3228524,1241696,74779,1172,8018,2751790, %U A286418 196846257,1723178763,1723178763,196846257,2751790,8018 %N A286418 Array read by antidiagonals: T(n,m) is the number of (undirected) cycles in the rook graph K_n X K_m. %H A286418 Andrew Howroyd, <a href="/A286418/b286418.txt">Table of n, a(n) for n = 1..78</a> %H A286418 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphCycle.html">Graph Cycle</a>, <a href="https://mathworld.wolfram.com/RookGraph.html">Rook Graph</a> %e A286418 Table starts: %e A286418 ================================================ %e A286418 m\n 1 2 3 4 5 %e A286418 --+--------------------------------------------- %e A286418 1 | 0 0 1 7 37 ... %e A286418 2 | 0 1 14 170 2904 ... %e A286418 3 | 1 14 312 13945 1241696 ... %e A286418 4 | 7 170 13945 3228524 1723178763 ... %e A286418 5 | 37 2904 1241696 1723178763 6198979538330 ... %e A286418 ... %Y A286418 Main diagonal is A234624. %Y A286418 Columns 1..3 are A002807, A341500, A341501. %Y A286418 Cf. A269562, A269565. %K A286418 nonn,tabl %O A286418 1,7 %A A286418 _Andrew Howroyd_, May 08 2017