a(n) = n! * (n^4 + n^2 + 1).

Terms

a(0) =1a(1) =3a(2) =42a(3) =546a(4) =6552a(5) =78120a(6) =959760a(7) =12353040a(8) =167771520a(9) =2410611840a(10) =36654508800a(11) =589291718400