Expansion of Product_{k>=1} (1 + 2^(k+1)*x^k) * (1 + 2^(k-1)*x^k).

Terms

a(0) =1a(1) =5a(2) =14a(3) =70a(4) =196a(5) =640a(6) =2248a(7) =6480a(8) =19072a(9) =56000a(10) =169792a(11) =466560a(12) =1327104a(13) =3642880a(14) =10030080a(15) =27776000a(16) =74541056a(17) =199065600a(18) =531505152a(19) =1401405440a(20) =3672801280a(21) =9674588160a(22) =25018564608a(23) =64701071360a(24) =166363136000a(25) =426159636480