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 A129012 #3 Mar 30 2012 16:50:41 %S A129012 1,1,1,2,3,3,7,12,12,27,38,38,86,128,128,264,373,373,749,1055,1055, %T A129012 2022,2765,2765 %N A129012 Isomer numbers for the constant-isomer series: the Kekulean even carbon series (ordinary and TRS benzenoid hydrocarbons). %C A129012 The terms occur in groups of three, X, X, Y. %C A129012 It would be nice to have generating functions for any of A129012-A129021. %D A129012 J. R. Dias, The Periodic Table Set as a Unifying Concept in Going from Benzenoid Hydrocarbons to Fullerene Carbons, in "The Periodic Table: Into the 21st Century", Edited by D. H. Rouvray and R. B. King, Research Studies Press Ltd, Baldock, Hertfordshire, England, 2004, 371-396. %Y A129012 Cf. A129013-A129021. %K A129012 nonn %O A129012 0,4 %A A129012 _N. J. A. Sloane_, based on email from Jerry R. Dias (DiasJ(AT)umkc.edu), May 08 2007