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

Terms

a(0) =0a(1) =0a(2) =1a(3) =2a(4) =4a(5) =8a(6) =16a(7) =28a(8) =47a(9) =78a(10) =126a(11) =198a(12) =306a(13) =464a(14) =694a(15) =1024a(16) =1490a(17) =2146a(18) =3061a(19) =4322a(20) =6052a(21) =8408a(22) =11592a(23) =15872a(24) =21592a(25) =29192a(26) =39242a(27) =52468a(28) =69788a(29) =92376