32071101048domain: NAppears in sequencesRencontres numbers: number of permutations of [n] with exactly one fixed point.at n=13A000240a(n) = floor( n! / e ).at n=13A014508a(n) = A000166(floor(n/2)) if n is even otherwise A000240(floor((n + 1)/2)).at n=27A371998