Partial products of A115975.

Terms

a(0) =1a(1) =2a(2) =6a(3) =24a(4) =120a(5) =840a(6) =6720a(7) =60480a(8) =665280a(9) =8648640a(10) =147026880a(11) =2793510720a(12) =64250746560