a(n) = Sum_{k=1..n} (-k)^(k+1).

A341330

a(n) = Sum_{k=1..n} (-k)^(k+1).

Terms

    a(0) =1a(1) =-7a(2) =74a(3) =-950a(4) =14675a(5) =-265261a(6) =5499540a(7) =-128718188a(8) =3358066213a(9) =-96641933787

External references