Denominator of Laguerre(n, -1).

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =24a(5) =60a(6) =720a(7) =2520a(8) =40320a(9) =25920a(10) =3628800a(11) =19958400a(12) =479001600a(13) =3113510400a(14) =87178291200a(15) =59439744000a(16) =426995712000