G.f.: 1/(1-2*x+2*x^2-x^3+x^4).

Terms

a(0) =1a(1) =2a(2) =2a(3) =1a(4) =-1a(5) =-4a(6) =-7a(7) =-8a(8) =-5a(9) =3a(10) =15a(11) =27a(12) =32a(13) =22a(14) =-8a(15) =-55a(16) =-104a(17) =-128a(18) =-95a(19) =17a(20) =200a(21) =399a(22) =510a(23) =405a(24) =-11a(25) =-721a(26) =-1525a(27) =-2024a(28) =-1708a(29) =-172