G.f.: Sum_{n>=0} (n-x)^n * x^n / (1 + n*x - x^2)^n.
A202365
G.f.: Sum_{n>=0} (n-x)^n * x^n / (1 + n*x - x^2)^n.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =10a(4) =54a(5) =336a(6) =2400a(7) =19440a(8) =176400a(9) =1774080a(10) =19595520a(11) =235872000a(12) =3073593600a(13) =43110144000a(14) =647610163200
External references
- oeis: A202365