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 A133712 #12 Apr 03 2020 07:53:18
%S A133712 0,0,420,15225,185031,1438906,8689306,44352346,200070606,818907792,
%T A133712 3093635652,10914809127,36278256537,114357327402,343708626298,
%U A133712 989318816383,2737219679833,7302776865288,18839417766108,47108352127209,114421884019959
%N A133712 Column l=5 of irregular triangle in A133709.
%p A133712 A133712 := proc(m)
%p A133712 A133709(m,5) ;
%p A133712 end proc:
%p A133712 seq(A133712(m),m=1..30) ; # _R. J. Mathar_, Nov 23 2011
%t A133712 T[m_, l_] := T[m, l] = If[l == 1, 1, Sum[(-1)^i Binomial[l, i]* Binomial[2^(l - i) + m - 2, m], {i, 0, l - 1}] - Sum[StirlingS2[l, i]* T[m, i], {i, 1, l - 1}]];
%t A133712 Table[T[m, 5], {m, 1, 30}] (* _Jean-François Alcover_, Apr 03 2020 *)
%Y A133712 Cf. A133709.
%K A133712 nonn
%O A133712 1,3
%A A133712 _N. J. A. Sloane_, Dec 30 2007