G.f.: A(x) = 1 + Sum_{n>=1} x^(n^2) * ((1-x)^n + 1/(1-x)^n).

Terms

a(0) =1a(1) =2a(2) =0a(3) =1a(4) =3a(5) =1a(6) =5a(7) =5a(8) =6a(9) =9a(10) =8a(11) =18a(12) =19a(13) =26a(14) =33a(15) =41a(16) =52a(17) =60a(18) =87a(19) =99a(20) =132a(21) =166a(22) =209a(23) =261a(24) =323a(25) =398a(26) =481a(27) =604a(28) =716a(29) =893