A127756 Row sums of the inverse of number triangle A(n,k) = 1/n! if k <= n <= 2k, 0 otherwise.

1, 1, 1, 5, 18, 97, 600, 4325, 35280, 322578, 3265920, 36288097, 439084800, 5748019800, 80951270400, 1220496081125, 19615115520000, 334764638243280, 6046686277632000, 115242726703426578

Offset

0,4

Comments

Row sums of A127755. a(2n) = A061079(n), n > 0.

Links

Table of n, a(n) for n=0..19.

Crossrefs

Sequence in context: A174082 A188329 A165962 * A228614 A158455 A009442

Adjacent sequences: A127753 A127754 A127755 * A127757 A127758 A127759

Keyword

nonn

Author

Paul Barry, Jan 28 2007

Status

approved