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 A105622 #3 Mar 30 2012 18:36:45
%S A105622 1,0,-3,-16,-104,-908,-9980,-130756,-1978044,-33864628,-646882700,
%T A105622 -13637768276,-314550050684,-7879500818548,-213050486593260,
%U A105622 -6184793428783156,-191870459680722524,-6335136849263878868,-221817478808912340620,-8209644712019737332436
%N A105622 Row sums of triangle A105620.
%C A105622 A105620 is the matrix inverse square-root of triangle A105615.
%o A105622 (PARI) {a(n)=local(R,M=matrix(n+3,n+3,m,j,if(m>=j,if(m==j,1,if(m==j+1,-2*j, polcoeff(1/sum(i=0,m-j,(2*i)!/i!/2^i*x^i)+O(x^m),m-j)))))); R=(M+M^0)/2;for(i=1,floor(2*log(n+2)),R=(R+M*R^(-1))/2); return(if(n<0,0,sum(k=0,n,R[n+1,k+1])))}
%Y A105622 Cf. A105615, A105620.
%K A105622 sign
%O A105622 0,3
%A A105622 _Paul D. Hanna_, Apr 16 2005