Expansion of (2*x*exp(x)-3)/(1-x).

Terms

a(0) =0a(1) =1a(2) =2a(3) =12a(4) =56a(5) =290a(6) =1752a(7) =12278a(8) =98240a(9) =884178a(10) =8841800a(11) =97259822a(12) =1167117888a(13) =15172532570a(14) =212415456008