775596313

Properties

Appears in sequences

• Ménage numbers: a(0) = 1, a(1) = -1, and for n >= 2, a(n) = number of permutations s of [0, ..., n-1] such that s(i) != i and s(i) != i+1 (mod n) for all i.at n=13A000179
• Same as A000179, except that a(0) = 2.at n=13A102761
• Ménage primes.at n=2A249510
• A variant of A000179 and A102761.at n=13A335700
• a(n) is the number of permutations pi in S_n such that pi(i) - i != 1 (mod n) and pi(i) - i != -1 (mod n) for all i.at n=13A354152
• Maximum value in the n-th row of A354408.at n=11A354409
• Prime numbersat n=39954501