Expansion of the g.f. x/((1+2x)(1-x-x^2)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =4a(4) =-5a(5) =15a(6) =-22a(7) =57a(8) =-93a(9) =220a(10) =-385a(11) =859a(12) =-1574a(13) =3381a(14) =-6385a(15) =13380a(16) =-25773a(17) =53143a(18) =-103702a(19) =211585a(20) =-416405a(21) =843756a(22) =-1669801a(23) =3368259a(24) =-6690150a(25) =13455325a(26) =-26789257a(27) =53774932a(28) =-107232053a(29) =214978335