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 A120649 #3 Mar 30 2012 16:50:29 %S A120649 1,1,1,1,1,1,3,4,4,1,9,16,16,4,1,39,85,84,32,7,1,169,439,465,210,57,7, %T A120649 1,819,2358,2714,1495,469,86,10,1,3969,12502,15732,10014,3750,834,124, %U A120649 10,1,19719,66471,90934,65746,28604,7864,1410,166,13,1 %N A120649 Triangle read by rows: numbers of isomers of unbranched a-4-catapolyoctagons. %D A120649 J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13. %e A120649 Triangle begins: %e A120649 1 %e A120649 1 1 %e A120649 1 1 1 %e A120649 3 4 4 1 %e A120649 9 16 16 4 1 %e A120649 39 85 84 32 7 1 %e A120649 169 439 465 210 57 7 1 %Y A120649 Columns give A121101, A121145, A121146. %K A120649 nonn,tabl %O A120649 0,7 %A A120649 _N. J. A. Sloane_, Aug 18 2006