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 A191643 #22 Sep 19 2015 18:08:26 %S A191643 2,8,22,94,454,2430,14214,89918,610182,4412958 %N A191643 Incorrect version of A001861. %D A191643 Carlier, Jacques; and Lucet, Corinne; A decomposition algorithm for network reliability evaluation. In First International Colloquium on Graphs and Optimization (GOI), 1992 (Grimentz). Discrete Appl. Math. 65 (1996), 141-156. %F A191643 There is an explicit formula in the reference (see p. 152). %o A191643 (PARI) a(n) = sum(j=1, k, stirling(k,j,2)*2^(j)) \\ _Michel Marcus_, Apr 25 2013 %Y A191643 Cf. A191644. %K A191643 dead %O A191643 1,1