%I #3 Mar 31 2012 20:47:17

%S 1,26,650,15600,358800,7893600,165765600,3315312000,62990928000,

%T 1133836704000,19275223968000,308403583488000,4626053752320000,

%U 64764752532480000,841941782922240000,10103301395066880000

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

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

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

%Y Cf. A106710.

%K nonn,fini

%O 0,2

%A _Luca Colucci_, May 17 2005