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 A094037 #4 May 10 2013 12:45:32 %S A094037 0,0,0,0,1,1345,738741,185165477,29458046177,3541242666045, %T A094037 354515664467077,31326419674855789,2535191648955942273, %U A094037 192567615994193565125,13962461827318220986133,978010022290154153870661 %N A094037 Number of connected 6-element antichains on a labeled n-set. %F A094037 E.g.f.: (exp(63*x) - 30*exp(47*x) + 120*exp(39*x) + 60*exp(35*x) + 60*exp(33*x) - 18*exp(32*x) - 339*exp(31*x) - 720*exp(29*x) + 810*exp(27*x) + 120*exp(26*x) + 480*exp(25*x) + 480*exp(24*x) - 600*exp(23*x) - 720*exp(22*x) - 240*exp(21*x) - 900*exp(20*x) + 1740*exp(19*x) + 615*exp(18*x) + 180*exp(17*x) + 435*exp(16*x) - 1445*exp(15*x) - 3270*exp(14*x) + 1710*exp(13*x) + 4620*exp(12*x) - 3360*exp(11*x) - 3210*exp(10*x) + 3360*exp(9*x) + 6810*exp(8*x) - 12465*exp(7*x) + 5985*exp(6*x) + 7110*exp(5*x) - 18555*exp(4*x) + 17884*exp(3*x) - 8352*exp(2*x) + 1764*exp(x) - 120)/6!. %Y A094037 Cf. A016269, A047707, A051112-A051118, A094033-A094037. %K A094037 nonn %O A094037 0,6 %A A094037 Goran Kilibarda, _Vladeta Jovovic_, Apr 22 2004