G.f.: 1/p(x) where p(x)=x^5 + 2x^4 - 2x^3 - x^2 + 2x - 1.

Terms

a(0) =1a(1) =-2a(2) =6a(3) =-15a(4) =38a(5) =-95a(6) =237a(7) =-590a(8) =1468a(9) =-3651a(10) =9079a(11) =-22575a(12) =56131a(13) =-139563a(14) =347004a(15) =-862774a(16) =2145156a(17) =-5333599a(18) =13261165a(19) =-32971820a(20) =81979285a(21) =-203828691a(22) =506788203a(23) =-1260049698a(24) =3132916721a(25) =-7789507968a(26) =19367394583a(27) =-48154000782