E.g.f.: exp(1 + x^2/2 - exp(x)).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =4a(5) =-7a(6) =21a(7) =-51a(8) =113a(9) =-498a(10) =1088a(11) =-3335a(12) =21407a(13) =-14653a(14) =232389a(15) =-1275288a(16) =-3636526a(17) =-44468245a(18) =-7468609a(19) =700603965a(20) =12178055777a(21) =67189448344a(22) =175549544778