G.f. 1/sum(k>=0, (-1)^k * x^(k*(k+1)/2)).

Terms

a(0) =1a(1) =1a(2) =1a(3) =0a(4) =-1a(5) =-2a(6) =-1a(7) =1a(8) =4a(9) =5a(10) =2a(11) =-5a(12) =-12a(13) =-13a(14) =-3a(15) =17a(16) =34a(17) =32a(18) =-1a(19) =-54a(20) =-93a(21) =-72a(22) =28a(23) =169a(24) =248a(25) =152a(26) =-147a(27) =-510a(28) =-646a(29) =-282