Column 3 in A104978.

Terms

a(0) =0a(1) =0a(2) =0a(3) =12a(4) =165a(5) =1430a(6) =10010a(7) =61880a(8) =352716a(9) =1899240a(10) =9806280a(11) =49031400a(12) =239028075a(13) =1141710570a(14) =5362579950a(15) =24837212400a(16) =113678010600a(17) =515030986800