1223236

Appears in sequences

• Number of permutations p of (1,2,3,...,n) such that k+p(k) is prime for 1<=k<=n.at n=15A073364
• Number of n X 3 0..1 arrays avoiding 0 0 1 and 0 1 0 horizontally and 0 0 1 and 0 1 1 vertically.at n=25A207118