A bisection of A121649; a(n) = A121649(2*n) = A121648(2*n)^(1/2).

Terms

a(0) =1a(1) =1a(2) =3a(3) =8a(4) =27a(5) =89a(6) =300a(7) =1008a(8) =3563a(9) =12483a(10) =44583a(11) =158600a(12) =572548a(13) =2057792a(14) =7451924a(15) =26913176a(16) =98321435a(17) =358017691a(18) =1312060393a(19) =4797471336a(20) =17666696455a(21) =64890598361a(22) =239454075896a(23) =881886659872