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 A089459 #4 Mar 30 2012 18:36:39 %S A089459 1,1,1,2,6,30,221,2201,27769,424757,7639190,157969167,3692733181, %T A089459 96293669499,2771232779481,87247362424120,2982901522141490, %U A089459 110057420712635526,4358745145279372293,184433423940319376323 %N A089459 Shifts 2 places left under the hyperbinomial transform. %F A089459 a(n+2) = sum(k=0, n, (n-k+1)^(n-k-1)*binomial(n, k)*a(k)), for n>=0, with a(0)=1, a(1)=1. %Y A089459 Cf. A088956, A001858. %K A089459 nonn %O A089459 0,4 %A A089459 _Paul D. Hanna_, Nov 04 2003