a(n) = n!*(1 - 1/2 + 1/3 - ... + c/n), where c = (-1)^(n+1).

A024167

a(n) = n!*(1 - 1/2 + 1/3 - ... + c/n), where c = (-1)^(n+1).

Terms

    a(0) =1a(1) =1a(2) =5a(3) =14a(4) =94a(5) =444a(6) =3828a(7) =25584a(8) =270576a(9) =2342880a(10) =29400480a(11) =312888960a(12) =4546558080a(13) =57424792320a(14) =948550176000

External references