(n+1) + (n+1)(n+2) + ..., with n terms.
A111686
(n+1) + (n+1)(n+2) + ..., with n terms.
Terms
- a(0) =2a(1) =15a(2) =144a(3) =1925a(4) =33648a(5) =726327a(6) =18636560a(7) =553680369a(8) =18684924840a(9) =705833193923
External references
- oeis: A111686
A111686
(n+1) + (n+1)(n+2) + ..., with n terms.