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 A038766 #5 Mar 30 2012 16:47:49 %S A038766 1,1,1,1,1,1,1,3,3,2,1,3,9,7,4,1,5,16,29,23,10,1,5,27,62,99,69,25,1,7, %T A038766 39,132,275,351,229,70,1,7,55,221,643,1121,1249,731,196,1,9,72,367, %U A038766 1278,2997,4584,4437,2385,574,1,9,93,540,2322,6678,13458,18012,15597,7657,1681 %N A038766 Triangle giving number of unbranched catapolytetragons, read by rows. %D A038766 S. J. Cyvin et al., Unbranched catacondensed polygonal systems containing hexagons and tetragons, Croatica Chem. Acta, 69 (1996), 757-774. %e A038766 1; 1,1; 1,1,1; 1,3,3,2; 1,3,9,7,4; ... %Y A038766 Last diagonal is A001998. %Y A038766 LCM's of all cycles: A060113. %K A038766 nonn,easy,tabl %O A038766 0,8 %A A038766 _N. J. A. Sloane_, May 03 2000