Row 6 of table A111528.

Terms

a(0) =1a(1) =1a(2) =8a(3) =78a(4) =876a(5) =10956a(6) =149472a(7) =2195208a(8) =34398288a(9) =571525200a(10) =10022997888a(11) =184897670112