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 A055288 #6 Mar 30 2012 17:37:10 %S A055288 1,-1,1,1,-2,1,0,2,-3,1,-3,2,4,-4,1,5,-11,4,6,-5,1,9,4,-26,9,9,-6,1, %T A055288 -44,72,3,-52,15,12,-7,1,-50,-82,213,-20,-94,24,16,-8,1,545,-857,-53, %U A055288 546,-82,-146,35,20,-9,1,572,1636,-3370,256,1288,-216,-232,50,25,-10 %N A055288 Matrix inverse of triangle A055277(n+1,k). %H A055288 <a href="/index/Ro#rooted">Index entries for sequences related to rooted trees</a> %e A055288 1; -1,1; 1,-2,1; 0,2,-3,1; -3,2,4,-4,1; ... %K A055288 sign,tabl %O A055288 1,5 %A A055288 _Christian G. Bower_, May 09 2000