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 A185759 #10 Feb 01 2025 14:55:11
%S A185759 9,154,2340,38325,704102,14570976,337738758,8697532008,246819113442,
%T A185759 7660379273261,258275171344333,9403520522325228,367786323703199388,
%U A185759 15381080863799688012,684987041358431417024,32366520461834117146792
%N A185759 A diagonal of triangle A185755.
%C A185759 A185755(n,k) equals the coefficient of x^n*y^k in the n-th iteration of x*(1+xy)/(1-x).
%o A185759 (PARI) {a(n)=local(A=x, G=x*(1+x*y)/(1-x)); for(i=1, n+2, A=subst(G, x, A+O(x^(n+3))));polcoeff(polcoeff(A, n+2,x),n-1,y)}
%Y A185759 Cf. A185755, A185756, A185757, A185758.
%K A185759 nonn
%O A185759 1,1
%A A185759 _Paul D. Hanna_, Feb 03 2011