%I A003013
%S A003013 1,1,4,15,52,165,486,1351,3592,9225,23050,56331,135180,
%T A003013 319501,745486,1720335,3932176,8912913,20054034,44826643,
%U A003013 99614740,220200981,484442134,1061158935,2315255832,5033164825
%N A003013 Expansion of 1+x*exp(x)+x^2*exp(2*x).
%F A003013 a(0) = 1, a(n) = (n^2-n)2^n/4 + n. a(n) = A002999(n) - n = A001815(n) 
               + n. - Ralf Stephan (ralf(AT)ark.in-berlin.de), Sep 02 2003
%Y A003013 Cf. A048482, A001787, A005183.
%Y A003013 Sequence in context: A055218 A107307 A005492 this_sequence A117202 A137213 
               A027853
%Y A003013 Adjacent sequences: A003010 A003011 A003012 this_sequence A003014 A003015 
               A003016
%K A003013 nonn
%O A003013 0,3
%A A003013 N. J. A. Sloane (njas(AT)research.att.com).