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 A103367 #4 Mar 30 2012 18:36:45
%S A103367 1,2,6,26,160,1372,15974,245142,4817712,118198568,3542890648,
%T A103367 127417949496,5415490994368,268526379444104,15363229400769566,
%U A103367 1004545432884250126,74441340170270921952,6205992783298302119536
%N A103367 Absolute row sums of triangle A103364, which equals the matrix inverse of the Narayana triangle (A001263).
%C A103367 The ratio of the absolute row sum to the absolute value of column 1 for row n of triangle A103364, as n grows, approaches the limit given by limit_{n->inf} Sum_{k=1,n} |A103364(n,k)| / |A103365(n)| = 4.37281937295201487280058335227924496590808747668123198019676685492873...
%o A103367 (PARI) {a(n)=if(n<1,0,sum(k=1,n,abs(matrix(n,n,m,j,binomial(m-1,j-1)*binomial(m,j-1)/j)^-1)[n,k]))}
%Y A103367 Cf. A001263, A103364, A103365, A103366.
%K A103367 nonn
%O A103367 2,2
%A A103367 _Paul D. Hanna_, Feb 02 2005