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 A360335 #21 Feb 08 2023 15:15:33
%S A360335 1,1,1,1,2,1,1,3,3,1,1,3,7,5,1,1,3,12,16,8,1,1,3,15,35,38,13,1,1,3,15,
%T A360335 63,105,89,21,1,1,3,15,90,226,329,209,34,1,1,3,15,105,417,841,1014,
%U A360335 491,55,1,1,3,15,105,645,1787,3251,3116,1153,89,1
%N A360335 Array read by antidiagonals downwards: A(n,m) = number of set partitions of [2n] into 2-element subsets {i, i+k} with 1 <= k <= m.
%F A360335 A(n,m) = A001147(n) = A104443(n,2) for m >= 2n - 1.
%e A360335 Square array begins:
%e A360335 1, 1, 1, 1, 1, 1, 1, 1, 1, ...
%e A360335 1, 2, 3, 3, 3, 3, 3, 3, 3, ...
%e A360335 1, 3, 7, 12, 15, 15, 15, 15, 15, ...
%e A360335 1, 5, 16, 35, 63, 90, 105, 105, 105, ...
%e A360335 1, 8, 38, 105, 226, 417, 645, 840, 945, ...
%e A360335 1, 13, 89, 329, 841, 1787, 3348, 5445, 7665, ...
%e A360335 1, 21, 209, 1014, 3251, 7938, 16717, 31647, 53250, ...
%e A360335 1, 34, 491, 3116, 12483, 36500, 86311, 180560, 344403, ...
%e A360335 1, 55, 1153, 9610, 47481, 167631, 459803, 1062435, 2211181, ...
%e A360335 ...
%Y A360335 Main diagonal is A014307.
%Y A360335 Columns 1..4 are A000012, A000045(n+1), A052967, A320346.
%Y A360335 Cf. A001147, A104443, A360333, A360334.
%K A360335 nonn,tabl
%O A360335 1,5
%A A360335 _Peter Dolland_, Feb 03 2023