a(n) = T(n,[ n/2 ]), T given by A027157.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =24a(5) =40a(6) =76a(7) =152a(8) =672a(9) =1088a(10) =2208a(11) =4416a(12) =20224a(13) =32384a(14) =67776a(15) =135552a(16) =632320a(17) =1006592a(18) =2144768a(19) =4289536a(20) =20238336a(21) =32100352a(22) =69203968a(23) =138407936a(24) =658079744a(25) =1041203200a(26) =2263351296a(27) =4526702592a(28) =21643526144a(29) =34182430720