a(n) = T(n,[ n/2 ]), where T is the array in A026268.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =5a(5) =9a(6) =27a(7) =46a(8) =145a(9) =244a(10) =796a(11) =1330a(12) =4438a(13) =7382a(14) =25034a(15) =41508a(16) =142479a(17) =235672a(18) =816620a(19) =1348204a(20) =4706977a(21) =7759105a(22) =27256963a(23) =44873972a(24) =158450461a(25) =260581699a(26) =924129535a(27) =1518390034a(28) =5404960900a(29) =8873524820