a(n) = A100631(n, floor(n/2)).

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =12a(5) =32a(6) =104a(7) =304a(8) =1008a(9) =3072a(10) =10272a(11) =32064a(12) =107712a(13) =341504a(14) =1150592a(15) =3688192a(16) =12451584a(17) =40239104a(18) =136053248a(19) =442442752a(20) =1497664512a(21) =4894728192a(22) =16583583744a(23) =54419632128a(24) =184511361024a(25) =607524225024