a(n+2) = a(n+1) + a(n) + A*t^n, with A = 1 and t = -2.

Terms

a(0) =0a(1) =1a(2) =2a(3) =1a(4) =7a(5) =0a(6) =23a(7) =-9a(8) =78a(9) =-59a(10) =275a(11) =-296a(12) =1003a(13) =-1341a(14) =3758a(15) =-5775a(16) =14367a(17) =-24176a(18) =55727a(19) =-99521a(20) =218350a(21) =-405459a(22) =861467a(23) =-1641144a(24) =3414627a(25) =-6615125a(26) =13576718a(27) =-26592839a(28) =54092743a(29) =-106717824