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 A324957 #3 Mar 21 2019 00:58:08
%S A324957 1,2,30,600,17980,701280,33904822,1956209024,131229583596,
%T A324957 10037690006400,862338700678884,82216457762199552,8614684257283258102,
%U A324957 984021646462806049280,121700458370370286320750,16202120194768984283381760,2310243113824870018738497732,351271199659878407029587277824,56734597035765569017356665543968,9700307843128908988513920450560000
%N A324957 a(n) is the coefficient of y^(n-1) in Product_{k=0..n-2} (n + (n + k)*y + n*y^2), for n >= 1.
%C A324957 a(n) = A324956(n,n-1) for n >= 1.
%o A324957 (PARI) {a(n) = polcoeff( prod(k=0, n-2, n + (n+k)*y + n*y^2 +y*O(y^n)), n-1, y)}
%o A324957 for(n=1, 25, print1(a(n), ", "))
%Y A324957 Cf. A324956.
%K A324957 nonn
%O A324957 1,2
%A A324957 _Paul D. Hanna_, Mar 21 2019