G.f.: 1-q = Sum_{k>=0} a(k)*q^k*Faq(k+1,q), where Faq(n,q) is the q-factorial of n.

Terms

a(0) =1a(1) =-1a(2) =1a(3) =-2a(4) =4a(5) =-7a(6) =11a(7) =-18a(8) =35a(9) =-76a(10) =166a(11) =-358a(12) =775a(13) =-1686a(14) =3638a(15) =-7716a(16) =16108a(17) =-33349a(18) =69022a(19) =-143605a(20) =301179a(21) =-636932a(22) =1355855a(23) =-2896168a(24) =6186750a(25) =-13183426a(26) =27988755a(27) =-59197443a(28) =124824911a(29) =-262699256