124124

Appears in sequences

• Number of (n+1) X 4 binary arrays with rows and columns in nondecreasing order and with no 2 X 2 subblock sum differing from a horizontal or vertical neighbor subblock sum by more than one.at n=18A184065
• 4n concatenated with itself.at n=30A248365
• Number of Qbar-isomorphism classes of elliptic curves E/Q with good reduction outside the first n prime numbers.at n=7A368080