1263360

Appears in sequences

• Number of ways n married couples can sit in a row without any spouses next to each other.at n=5A007060
• Numbers k such that 2*k+1, 4*k+1, 8*k+1, 16*k+1, 32*k+1 and 64*k+1 are primes.at n=16A124414
• Number of permutations of 1..n with no adjacent pair summing to n+1.at n=10A173841
• Triangle T(n,k) of ways n couples can sit in a row with exactly k of them together.at n=15A193639
• Numbers k such that A051378(k) > 2*k and A333926(k) <= 2*k.at n=20A349284