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 A003455 M0909 #22 Dec 26 2021 14:25:17 %S A003455 1,2,3,11,29,122,479,2113,9369,43392,203595,975563,4736005,23296394, %T A003455 115811855,581324861,2942579633,15008044522,77064865555,398150807179, %U A003455 2068470765261,10800665952376,56658467018647,298489772155137,1578702640556193 %N A003455 Number of nonequivalent dissections of an n-gon by nonintersecting diagonals up to rotation. %C A003455 Total number of dissections of an n-gon into polygons without reflection. - _Sean A. Irvine_, May 15 2015 %D A003455 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A003455 Andrew Howroyd, <a href="/A003455/b003455.txt">Table of n, a(n) for n = 3..200</a> %H A003455 P. Lisonek, <a href="http://dx.doi.org/10.1006/jsco.1995.1066">Closed forms for the number of polygon dissections</a>, Journal of Symbolic Computation 20 (1995), 595-601. %H A003455 Ronald C. Read, <a href="http://dx.doi.org/10.1007/BF03031688">On general dissections of a polygon</a>, Aequat. math. 18 (1978) 370-388. %o A003455 (PARI) \\ See A295495 for DissectionsModCyclic(). %o A003455 DissectionsModCyclic(apply(v->1, [1..30])) \\ _Andrew Howroyd_, Nov 22 2017 %Y A003455 Cf. A001004, A003454, A003456, A005034, A295224, A295495. %K A003455 nonn %O A003455 3,2 %A A003455 _N. J. A. Sloane_ %E A003455 More terms from _Sean A. Irvine_, May 15 2015 %E A003455 Name clarified by _Andrew Howroyd_, Nov 22 2017