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 A360877 #8 Feb 16 2025 08:34:04 %S A360877 0,1,1,6,12,6,30,129,129,30,160,1984,4536,1984,160,975,45945,310542, %T A360877 310542,45945,975,6846,1524156,38298270,111933456,38298270,1524156, %U A360877 6846 %N A360877 Array read by antidiagonals: T(m,n) is the number of (undirected) paths in the rook graph K_m X K_n. %H A360877 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/GraphPath.html">Graph Path</a>. %H A360877 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/RookGraph.html">Rook Graph</a>. %e A360877 Array begins: %e A360877 ============================================== %e A360877 m\n| 1 2 3 4 5 ... %e A360877 ---+------------------------------------------ %e A360877 1 | 0 1 6 30 160 ... %e A360877 2 | 1 12 129 1984 45945 ... %e A360877 3 | 6 129 4536 310542 38298270 ... %e A360877 4 | 30 1984 310542 111933456 ... %e A360877 5 | 160 45945 38298270 ... %e A360877 ... %Y A360877 Main diagonal is A288967. %Y A360877 Rows 1..2 are A038155, A360878. %Y A360877 Cf. A269562, A269565, A286418, A360851, A360855. %K A360877 nonn,tabl,more %O A360877 1,4 %A A360877 _Andrew Howroyd_, Feb 25 2023