Expansion of 1/(2 - Product_{k>=1} 1/(1 + x^k)).

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =4a(5) =-7a(6) =12a(7) =-21a(8) =38a(9) =-68a(10) =120a(11) =-212a(12) =377a(13) =-670a(14) =1188a(15) =-2107a(16) =3740a(17) =-6638a(18) =11778a(19) =-20898a(20) =37084a(21) =-65808a(22) =116775a(23) =-207212a(24) =367696a(25) =-652478a(26) =1157815a(27) =-2054524a(28) =3645730a(29) =-6469316