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 A126456 #5 Feb 03 2015 19:54:40
%S A126456 1,5,55,1330,58905,4187106,437353560,63140314380,12049276177620,
%T A126456 2938311614386005,891655291709643461,329600203128234828790,
%U A126456 145830232567505064233200,76102715775896720790887700
%N A126456 Column 1 of triangle A126454; a(n) = C( C(n+3,3) + 1, n).
%t A126456 Table[Binomial[Binomial[n+3,3]+1,n],{n,0,20}] (* _Harvey P. Dale_, Feb 03 2015 *)
%o A126456 (PARI) a(n)=binomial((n+1)*(n+2)*(n+3)/3!+1, n)
%Y A126456 Cf. A126454, A126455; A126447, A126452, A126459.
%K A126456 nonn
%O A126456 0,2
%A A126456 _Paul D. Hanna_, Dec 27 2006