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 A291656 #24 Sep 12 2020 02:23:16
%S A291656 0,0,1,0,1,2,0,1,4,3,0,1,10,23,4,0,1,28,259,176,5,0,1,82,3527,12916,
%T A291656 1689,6,0,1,244,51331,1213136,1057221,19524,7,0,1,730,762743,
%U A291656 123296356,885533769,128816766,264207,8,0,1,2188,11406979,12820180976,809068942341,1179489355164,21878089479,4098240,9
%N A291656 Square array T(n,k), n>=0, k>=0, read by antidiagonals: T(n,k) = ((2n-1)!!)^k * Sum_{i=1..n} 1/(2*i-1)^k.
%H A291656 Seiichi Manyama, <a href="/A291656/b291656.txt">Antidiagonals n = 0..54, flattened</a>
%F A291656 T(0,k) = 0, T(1,k) = 1 and T(n+1, k) = ((2*n-1)^k+(2*n+1)^k) * T(n, k) - (2*n-1)^(2*k) * T(n-1, k).
%e A291656 Square array begins:
%e A291656 0, 0, 0, 0, 0, ...
%e A291656 1, 1, 1, 1, 1, ...
%e A291656 2, 4, 10, 28, 82, ...
%e A291656 3, 23, 259, 3527, 51331, ...
%e A291656 4, 176, 12916, 1213136, 123296356, ...
%Y A291656 Columns k=0-5 give: A001477, A004041(n+1), A001824(n+1), A291585, A291586, A291587.
%Y A291656 Rows n=0-2 give: A000004, A000012, A034472.
%Y A291656 Main diagonal gives A291676.
%Y A291656 Cf. A291556.
%K A291656 nonn,tabl
%O A291656 0,6
%A A291656 _Seiichi Manyama_, Aug 28 2017