a(n) = ((-1)^n*(2^n-1) + Sum_{k>=1} (k^n*(k^2+k-1)/(k+2)!))/exp(1).

A229091

a(n) = ((-1)^n*(2^n-1) + Sum_{k>=1} (k^n*(k^2+k-1)/(k+2)!))/exp(1).

Terms

    a(0) =0a(1) =2a(2) =0a(3) =14a(4) =20a(5) =152a(6) =532a(7) =2914a(8) =14604a(9) =83342a(10) =494164a(11) =3127016a(12) =20810088a(13) =145645866a(14) =1067655656a(15) =8177942670a(16) =65292914084a(17) =542226906224

External references