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 A126446 #17 Sep 08 2022 08:45:29
%S A126446 1,1,6,120,4845,324632,32468436,4529365776,840261910995,
%T A126446 200063149171380,59473554359599446,21592914273609648996,
%U A126446 9403538945961296957821,4838670732821812768919800,2904538537066424425438417800
%N A126446 Column 0 of triangle A126445; a(n) = binomial( binomial(n+2,3), n).
%H A126446 Vincenzo Librandi, <a href="/A126446/b126446.txt">Table of n, a(n) for n = 0..200</a>
%t A126446 Table[Binomial[n (n + 1) (n + 2) / 3!, n], {n, 0, 20}] (* _Vincenzo Librandi_, Mar 04 2018 *)
%o A126446 (PARI) a(n)=binomial(n*(n+1)*(n+2)/3!, n)
%o A126446 (Sage) [(binomial(binomial(n+3,n),n+1)) for n in range(-1, 12)] # _Zerinvary Lajos_, Nov 30 2009
%o A126446 (Magma) [(Binomial(Binomial(n+3, n), n+1)): n in [-1..20]]; // _Vincenzo Librandi_, Mar 04 2018
%Y A126446 Cf. A126445; A126447, A126448, A126449; A126451, A126455, A126458.
%K A126446 nonn
%O A126446 0,3
%A A126446 _Paul D. Hanna_, Dec 27 2006