6604900

Appears in sequences

• Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=27A207364
• Number of nX6 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 0 1 1 vertically.at n=13A207366
• Number of free pure achiral multifunctions (with empty expressions allowed) with one atom and n positions.at n=17A317882