226521

Appears in sequences

• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only either as two by three or three by two blocks.at n=11A146153
• Number of -n..n arrays of 5 elements with first and second differences also in -n..n.at n=7A201090
• Number of length 4 1..(n+1) arrays with every leading partial sum divisible by 2 or 3.at n=31A257066