G.f. A(x) satisfies: A(x) = 1 / (1 - x + x^4 * A(x)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =0a(5) =-2a(6) =-5a(7) =-9a(8) =-12a(9) =-10a(10) =3a(11) =35a(12) =91a(13) =163a(14) =215a(15) =163a(16) =-136a(17) =-858a(18) =-2107a(19) =-3675a(20) =-4639a(21) =-2879a(22) =5161a(23) =23741a(24) =54910a(25) =91988a(26) =108843a(27) =47483a(28) =-186582a(29) =-700420