Row sums of the inverse of number triangle A(n,k) = 1/n! if k <= n <= 2k, 0 otherwise.
A127756
Row sums of the inverse of number triangle A(n,k) = 1/n! if k <= n <= 2k, 0 otherwise.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =5a(4) =18a(5) =97a(6) =600a(7) =4325a(8) =35280a(9) =322578a(10) =3265920a(11) =36288097a(12) =439084800a(13) =5748019800a(14) =80951270400
External references
- oeis: A127756