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 A176638 #2 Mar 30 2012 18:40:52 %S A176638 1,2,5,12,34,115,446,1881,8386,38472,179701,849285,4047541,19415118, %T A176638 93623028,453486806,2205081449,10758731196,52651373968,258365785954, %U A176638 1270930958357,6265738653554,30952863554094,153191072337297 %N A176638 Partial sums of A018190. %C A176638 Partial sums of number of planar simply-connected polyhexes (or benzenoid hydrocarbons) with n hexagons. The only known primes in the partial sum are 2 and 5. %F A176638 a(n) = SUM[i=1..n] A018190(i). %e A176638 a(6) = 1 + 1 + 3 + 7 + 22 + 81 = 115. %Y A176638 Cf. A000228, A002216, A018190, A038142-A038147. %K A176638 nonn %O A176638 1,2 %A A176638 _Jonathan Vos Post_, Apr 22 2010