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 A091353 #3 Mar 30 2012 18:36:40 %S A091353 1,3,9,30,115,510,2602,15133,99367,729962,5949393,53392902,524077321, %T A091353 5592200388,64520858034,801031071955,10654883235991,151253483735767, %U A091353 2283450321888155,36544617881242655,618220383026770560 %N A091353 Row sums of the matrix square of triangle A091351, in which the k-th column lists the row sums of A091351^k (the k-th power of A091351 when considered as a lower triangular matrix). %C A091353 Also equals the second column of triangle A091351. %Y A091353 Cf. A091351, A091352, A091354. %K A091353 nonn %O A091353 0,2 %A A091353 _Paul D. Hanna_, Jan 02 2004