176214840

Appears in sequences

• Rencontres numbers: number of permutations of [n] with exactly one fixed point.at n=11A000240
• a(n) = floor( n! / e ).at n=11A014508
• Triangle read by rows: T(n-1,k), where n >= 2 and 1 <= k <= floor(n/2), is the number of permutations of (1, 2, ..., n) having k consecutive pairs but no consecutive sequences of length greater than 2.at n=38A289632
• a(n) = A000166(floor(n/2)) if n is even otherwise A000240(floor((n + 1)/2)).at n=23A371998