A106793 Number of words (over an alphabet of size 26) of length n with all different letters.

1, 26, 650, 15600, 358800, 7893600, 165765600, 3315312000, 62990928000, 1133836704000, 19275223968000, 308403583488000, 4626053752320000, 64764752532480000, 841941782922240000, 10103301395066880000

Offset

0,2

Links

Table of n, a(n) for n=0..15.

Formula

a(n) = 26! / (26 - n)!

Example

a(2) = 650 because 26! / 24! = 650

Crossrefs

Cf. A106710.

Sequence in context: A249863 A014913 A285397 * A162812 A163177 A163526

Adjacent sequences: A106790 A106791 A106792 * A106794 A106795 A106796

Keyword

nonn,fini

Author

Luca Colucci, May 17 2005

Status

approved