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 A234324 #11 Feb 19 2022 12:39:03
%S A234324 1,5,273,44473,14739153,8261931405,7026231453265,8439654758970225,
%T A234324 13611213226804376865,28383081191068916580565,
%U A234324 74326386672885754888959569,238812235698229573137588936105,923793013650701305781038113833585,4235104161629281000608041716747118685
%N A234324 Central terms of the triangle of central factorial numbers (A008955).
%C A234324 a(n) = A008955(2*n,n).
%H A234324 Reinhard Zumkeller, <a href="/A234324/b234324.txt">Table of n, a(n) for n = 0..120</a>
%F A234324 a(n) ~ c * d^n * n!^2 / n^(3/2), where d = 30.472614208903344955058219429421999299236787591960717... and c = 0.27436634881777520262458169083560234658... - _Vaclav Kotesovec_, Aug 28 2017
%p A234324 b:= proc(n, k) option remember; `if`(k=0, 1,
%p A234324 add(b(j-1, k-1)*j^2, j=1..n))
%p A234324 end:
%p A234324 a:= n-> b(2*n, n):
%p A234324 seq(a(n), n=0..14); # _Alois P. Heinz_, Feb 19 2022
%t A234324 Flatten[{1, Table[Coefficient[Expand[Product[1 + k^2*x, {k, 0, 2*n}]], x^n], {n, 1, 15}]}] (* _Vaclav Kotesovec_, Aug 28 2017 *)
%t A234324 Table[Sum[(-1)^(n-j) * StirlingS1[2*n+1, 2*n+1-j] * StirlingS1[2*n+1, j+1], {j, 0, 2*n}], {n, 0, 15}] (* _Vaclav Kotesovec_, Aug 28 2017 *)
%o A234324 (Haskell)
%o A234324 a234324 n = a008955 (2 * n) n
%Y A234324 Cf. A008955, A129505.
%K A234324 nonn
%O A234324 0,2
%A A234324 _Reinhard Zumkeller_, Dec 24 2013