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 A140958 #4 Mar 30 2012 18:51:58 %S A140958 3,36,108,420,684,1008,1332,1668,2076,2772,2952,3168,3576,4236,4776, %T A140958 5148,5532,5892,6312,6696,7008,7776,8064,8640,8964,9648,10044,10368, %U A140958 10692,11376,12600,13872,14460,15072,15288,15732,15984,16344,17280,17712,18132,18876 %N A140958 A090801(2n-1)+A090801(2n). %C A140958 All terms are multiples of 3. %F A140958 a(n) == 0 (mod 6), n>1. %K A140958 nonn %O A140958 1,1 %A A140958 _Paul Curtz_, Jul 26 2008 %E A140958 Edited and extended by _R. J. Mathar_, Sep 07 2009