Third column of triangle in A179898.

Terms

a(0) =1a(1) =6a(2) =40a(3) =300a(4) =2475a(5) =22022a(6) =208208a(7) =2068560a(8) =21414900a(9) =229523800a(10) =2533942752a(11) =28698821320a(12) =332357673375