a(n) = A163176(n+1)*A003557(n+1).

Terms

a(0) =1a(1) =1a(2) =4a(3) =4a(4) =48a(5) =16a(6) =576a(7) =576a(8) =11520a(9) =768a(10) =9216a(11) =3072a(12) =3870720a(13) =552960a(14) =442368a(15) =442368a(16) =26542080a(17) =8847360a(18) =2229534720a(19) =445906944a(20) =70071091200a(21) =6370099200a(22) =76441190400a(23) =25480396800a(27) =81537269760