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 A133711 #12 Apr 03 2020 07:54:04
%S A133711 0,0,140,1435,7693,30450,100330,291265,769015,1883436,4336320,9475195,
%T A133711 19790605,39733150,77020830,144681850,264178990,470096240,817045500,
%U A133711 1389681375,2317008105,3792539410,6102347050,9663627675,15077153821,23197881100
%N A133711 Column l=4 of irregular triangle in A133709.
%p A133711 A133711 := proc(m)
%p A133711 A133709(m,4) ;
%p A133711 end proc:
%p A133711 seq(A133711(m),m=1..30) ; # _R. J. Mathar_, Nov 23 2011
%t A133711 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 A133711 Table[T[m, 4], {m, 1, 30}] (* _Jean-François Alcover_, Apr 03 2020 *)
%K A133711 nonn
%O A133711 1,3
%A A133711 _N. J. A. Sloane_, Dec 30 2007