G.f.: Sum_{k>=0} x^(k*(k+1)/2) / Product_{j=1..k} (1 - x^(2*j))^2.

Terms

a(0) =1a(1) =1a(2) =0a(3) =3a(4) =0a(5) =5a(6) =1a(7) =9a(8) =2a(9) =13a(10) =6a(11) =20a(12) =12a(13) =27a(14) =23a(15) =39a(16) =40a(17) =51a(18) =69a(19) =70a(20) =108a(21) =92a(22) =169a(23) =125a(24) =252a(25) =166a(26) =370a(27) =227a(28) =527a(29) =307