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 A121974 #4 Mar 30 2012 17:25:49 %S A121974 1,42,1410,32326,561378,8069192,101090191,1141425811,11879179287 %N A121974 Number of isomeric aza-benzenoids with eight nitrogen atoms. %D A121974 N. Trinajstich, Z. Jericevic, J. V. Knop, W. R. Muller and K. Szymanski, "Computer generation of isomeric structures", Pure and Appl. Chem., vol. 55 (1983) pp. 379-390. %e A121974 If n=5 then the number of isomeric aza-benzenoids with eight nitrogen atoms is 32326. Here n is the number of hexagons. %K A121974 nonn %O A121974 2,2 %A A121974 _Parthasarathy Nambi_, Sep 05 2006