a(n)=(A002866(n+1) - A036691(n))/192.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =1a(5) =30a(6) =600a(7) =11760a(8) =257040a(9) =6048000a(10) =147571200a(11) =802982400a(12) =105409382400