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 A243991 #11 Jan 30 2015 12:11:48 %S A243991 1,7,9,2,2,6,3,0,0,4,8,5,8,5,6,3,3,0,6,0,2,6,0,8,4,3,3,9,6,7,7,3,4,9, %T A243991 6,2,7,2,9,8,4,7,0,8,3,7,4,7,6,1,4,9,9,6,0,4,1,0,0,4,7,9,7,9,1,6,7,2, %U A243991 8,3,7,4,8,3,8,1,8,7,2,4,9,8,7,3,6,9,3,6,7,8,9,0,3,8,7,1,2,4,7,4,7,2 %N A243991 Decimal expansion of sum of reciprocals of Bell numbers for n>0. %C A243991 1.792263004858... %p A243991 with(combinat, bell): evalf(sum(1/bell(n), n = 1..infinity), 120); # _Vaclav Kotesovec_, Jan 30 2015 %Y A243991 Cf. A000110, A078506, A079586, A093540. %K A243991 nonn,cons %O A243991 1,2 %A A243991 _Franklin T. Adams-Watters_, Jun 17 2014