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 A203269 #12 Jul 16 2015 22:09:56 %S A203269 1,2,8,4,132,24,1556,88,5364,168,5612,136,1128168,28656,86804,1672, %T A203269 3434920,48080,173886368,2462176,4093653652,62126504,4292224444, %U A203269 10991336,182512332988,4948498616 %N A203269 Row sums of triangle A202917. %C A203269 If p is prime, then a(p-1)==2 mod p. At least up to n=251, there is only one nonprime n for which a(n-1)==2 mod n. It is n=18 for which a(18-1)=48080==2(mod 18). %Y A203269 Cf. A202917, A202941. %K A203269 nonn %O A203269 0,2 %A A203269 _Vladimir Shevelev_ and _Peter J. C. Moses_, Dec 31 2011