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 A144080 #2 Mar 30 2012 17:25:51 %S A144080 1,14,19,46,85,155,233,350,494,659,878,1163,1460,1828,2260,2726,3271, %T A144080 3873,4564,5321,6151,7032,8044,9151 %N A144080 Positions of hexagonal pyramidal numbers in the EKG sequence. %e A144080 The hexagonal pyramidal number 9500 is located at position 9151 in the EKG sequence. %Y A144080 A002412, A064413 %K A144080 nonn %O A144080 1,2 %A A144080 _Parthasarathy Nambi_, Sep 09 2008