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 A324961 #3 Mar 20 2019 20:13:41
%S A324961 1,2,8,42,268,2000,17038,162890,1725372,20044728,253332924,3459443988,
%T A324961 50751642214,795946804016,13287749613058,235247030990910,
%U A324961 4402121435984292,86812342423952520,1799413314325764232,39108496756464803888,889322428578635843156,21117181548344260655472,522654439233442389220252,13460850532654848043445348,360199399036948435113653582,10000217284416098095635943300,287673368509370723571678876660,8564090161107702738179495471400
%N A324961 a(n) is the coefficient of y^n in Product_{k=0..n-1} (1 + (k+2)*y + y^2), for n >= 0.
%C A324961 a(n) = A324960(n,n) for n >= 0.
%o A324961 (PARI) {a(n) = polcoeff( prod(m=0, n-1, 1 + (m+2)*y + y^2 +y*O(y^n)), n, y)}
%o A324961 for(n=0, 30, print1(a(n), ", "))
%Y A324961 Cf. A324960, A324962.
%K A324961 nonn
%O A324961 0,2
%A A324961 _Paul D. Hanna_, Mar 20 2019