a(n) = (n+2)!(1/3 - 1/4 + ... + c/(n+2)), where c=(-1)^(n+1).

A024176

a(n) = (n+2)!(1/3 - 1/4 + ... + c/(n+2)), where c=(-1)^(n+1).

Terms

    a(0) =2a(1) =2a(2) =34a(3) =84a(4) =1308a(5) =5424a(6) =89136a(7) =528480a(8) =9442080a(9) =73388160a(10) =1433047680a(11) =13835646720a(12) =294712992000

External references