16612433139domain: NAppears in sequencesa(n) is the number of permutations p of {1, 2, ..., n} such that for any k in 1..n, k and p(k) share a common 1-bit.at n=15A352857a(n) is the number of permutations p of {1, 2, ..., n} such that for any k in 1..n, k and p(k) share a common 1-bit.at n=16A352857