a(n) = product{k=1 to n} A127562(k).

Terms

a(0) =1a(1) =2a(2) =6a(3) =36a(4) =144a(5) =1152a(6) =13824a(7) =248832a(8) =2488320a(9) =39813120a(10) =796262400a(11) =19906560000a(12) =378224640000