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 A132043 #3 Mar 31 2012 14:47:13 %S A132043 2,4,8,17,38,95,268,917,4086 %N A132043 Number of bitransversal (transversal and dual transversal) matroids on n unlabeled elements. %C A132043 A transversal matroid is a matroid whose independent sets are the partial transversals of a family of subsets of [1..n], while a bitransversal matroid is a transversal matroid whose dual is transversal. The principal (or fundamental) transversal matroids enumerated by A049312 form an important subset of bitransversal matroids. %D A132043 Jensen, P. M., Binary fundamental matroids. Algebraic methods in graph theory, Vol. I, II (Szeged, 1978), pp. 281-296, Colloq. Math. Soc. Janos Bolyai, 25, North-Holland, Amsterdam-New York, 1981 %Y A132043 Cf. A049312. %K A132043 nonn %O A132043 1,1 %A A132043 _Gordon F. Royle_, Oct 30 2007