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 A120650 #3 Mar 30 2012 16:50:29 %S A120650 1,1,1,1,1,1,3,4,4,1,12,21,19,4,1,63,138,123,40,7,1,342,864,834,330, %T A120650 73,7,1,1998,5526,5796,2814,747,112,10,1,11772,34992,40014,22464,7218, %U A120650 1359,163,10,1,70308,221724,274590,174798,65583,15372,2307,220,13,1,420552,1399680,1867320,1321920,567540,157284,29100,3540,289,13,1 %N A120650 Triangle read by rows: numbers of isomers of unbranched a-4-catapolynonagons. %D A120650 J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13. %e A120650 Triangle begins %e A120650 1 %e A120650 1 1 %e A120650 1 1 1 %e A120650 3 4 4 1 %e A120650 12 21 19 4 1 %e A120650 63 138 123 40 7 1 %e A120650 342 864 834 330 73 7 1 %Y A120650 Columns give A121123-A121127. %K A120650 nonn,tabl %O A120650 0,7 %A A120650 _N. J. A. Sloane_, Aug 18 2006