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 A128602 #14 May 31 2020 22:04:34
%S A128602 1,3,12,60,315,1869,11472,74797,502908,3505031,24973089,182208083,
%T A128602 1352620790,10207771213,78082422354,604699597868,4733082767467,
%U A128602 37406134058641,298165102770381,2395219866441531,19376637845028027,157757577529194488,1291926016200778464
%N A128602 Row sums of triangle A128567.
%C A128602 A128567 is the matrix square of Parker's partition triangle A047812.
%F A128602 a(n) = Sum_{s=0..n-1} A047812(n,s)*A000108(s+1) for n >= 1. - _Petros Hadjicostas_, May 31 2020
%o A128602 (PARI) {a(n)=local(M);M=matrix(n+1,n+1,r,c,if(r<c,0,if(r==0,1, polcoeff(prod(j=r+1,2*r,1-q^j)/prod(j=1,r,1-q^j),(r+1)*(c-1), q)))); sum(k=0,n,(M^2)[n+1,k+1])}
%o A128602 /* To display results because the offset was changed: */
%o A128602 vector(28, n, a(n-1)) \\ _Petros Hadjicostas_, May 31 2020
%Y A128602 Cf. A000108, A047812, A128567, A128568 (column 1), A128569 (column 2).
%K A128602 nonn
%O A128602 1,2
%A A128602 _Paul D. Hanna_, Mar 12 2007
%E A128602 Offset changed by _Petros Hadjicostas_, May 31 2020 to agree with A128567