Records in A006863.

Terms

a(0) =1a(1) =24a(2) =240a(3) =504a(4) =65520a(5) =131040a(6) =171864a(7) =138181680a(8) =6814407600a(9) =20174525280a(10) =45185409360a(11) =558781423200a(12) =685933859520