a(n) = T(n, floor(n/2)), where T is given by A026552.

Terms

a(0) =1a(1) =1a(2) =2a(3) =2a(4) =7a(5) =8a(6) =24a(7) =28a(8) =93a(9) =111a(10) =362a(11) =436a(12) =1452a(13) =1763a(14) =5880a(15) =7176a(16) =24089a(17) =29521a(18) =99386a(19) =122182a(20) =412637a(21) =508595a(22) =1721500a(23) =2126312a(24) =7211536a(25) =8923136a(26) =30312960a(27) =37563930a(28) =127790379a(29) =158563368