Expansion of e.g.f. (exp(x)-1)*(exp(x)-x)*(exp(x)-x^2/2).

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =31a(5) =96a(6) =314a(7) =1072a(8) =3693a(9) =12556a(10) =41800a(11) =136236a(12) =435923a(13) =1374088a(14) =4280358a(15) =13211704a(16) =40492633a(17) =123440724a(18) =374774660a(19) =1134346228a(20) =3425446335a(21) =10326139696a(22) =31088511778a(23) =93507747360a(24) =281053811141a(25) =844319049436