149540

Appears in sequences

• Number of (n+1)X(4+1) 0..2 arrays with the upper median of every 2X2 subblock differing from its horizontal and vertical neighbors by exactly one.at n=14A237633
• Number of n X 2 0..1 arrays with each 1 adjacent to 2 or 3 king-move neighboring 1s.at n=11A295979
• Numbers k for which k = phi(k') + phi(k''), where phi is the Euler totient function (A000010), k' the arithmetic derivative of k (A003415) and k'' the second arithmetic derivative of k (A068346).at n=31A352332