Expansion of e.g.f.: exp(x)*(exp(x)-1)*(exp(x)-x).

Terms

a(0) =0a(1) =1a(2) =3a(3) =10a(4) =37a(5) =136a(6) =479a(7) =1618a(8) =5289a(9) =16876a(10) =52915a(11) =163846a(12) =502781a(13) =1532896a(14) =4651911a(15) =14070394a(16) =42456913a(17) =127894996a(18) =384799067a(19) =1156756462a(20) =3475250085a(21) =10436235976a(22) =31330727983a(23) =94038321250a(24) =282211432697a(25) =846835624636