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 A107885 #3 Mar 30 2012 18:36:46
%S A107885 1,3,6,16,63,351,2609,24636,284631,3909926,62459868,1140206571,
%T A107885 23453446130,537365482536,13583603874930,375783149051267,
%U A107885 11299149697288503,367080116280553305,12818485840320445236
%N A107885 Column 0 of triangle A107884.
%F A107885 G.f.: 1 = Sum_{k>=0} a(k)*x^k*(1-x)^(3 + k*(k-1)/2).
%e A107885 1 = 1*(1-x)^3 + 3*x*(1-x)^3 + 6*x^2*(1-x)^4 +
%e A107885 16*x^3*(1-x)^6 + 63*x^4*(1-x)^9 + 351*x^5*(1-x)^13 +...
%o A107885 (PARI) {a(n)=polcoeff(1-sum(k=0,n-1,a(k)*x^k*(1-x+x*O(x^n))^(3+k*(k-1)/2)),n)}
%Y A107885 Cf. A107884, A107886, A107887, A107888.
%K A107885 nonn
%O A107885 0,2
%A A107885 _Paul D. Hanna_, Jun 04 2005