1429824

Appears in sequences

• Number of n X n binary arrays with all ones connected only in two by two blocks.at n=8A145857
• Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in two by two blocks.at n=18A145859
• Number of nX9 binary arrays with each 1 adjacent to exactly one 1 vertically and one 1 horizontally.at n=8A183341
• 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=20A207364