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 A098448 #3 Mar 30 2012 18:36:43 %S A098448 1,2,4,9,24,79,340,2090,20613,374593,14797043,1558788465,568317523370, %T A098448 1002992052280356,13173490079341336160,2227644152149802108130325, %U A098448 9740856579902962818887540217002 %N A098448 Row sums of triangle A098447, in which diagonal n equals column 0 of the (n+1)-th matrix power of A098447. %Y A098448 Cf. A098447. %K A098448 nonn %O A098448 0,2 %A A098448 _Paul D. Hanna_, Sep 07 2004