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 A113102 #7 Jun 20 2022 04:14:36
%S A113102 1,20,894,108292,39188597,45157269264,172969059719500,
%T A113102 2268555493366383236,104065414379018585400528,
%U A113102 16965802042440759287849083708,9953305892540385313201626908460431
%N A113102 Column 1 of triangle A113101.
%o A113102 (PARI) {a(n)=local(M=matrix(n+1,n+1));for(r=1,n+1, for(c=1,r, M[r,c]=if(r==c,1,if(c>1,(M^4)[r-1,c-1])+(M^4)[r-1,c]))); return(if(n<1,0,(M^4)[n+1,2]))}
%Y A113102 Cf. A113101.
%K A113102 nonn
%O A113102 1,2
%A A113102 _Paul D. Hanna_, Oct 14 2005
%E A113102 Offset changed to 1 by _Georg Fischer_, Jun 20 2022