A225981 Number of nX7 binary arrays whose sum with another nX7 binary array containing no more than two 1s has rows and columns in lexicographically nondecreasing order.

64, 1616, 49811, 1825607, 69784592, 2513743785, 80901937149, 2279339811483, 56056577764123, 1210023577040820, 23129995837890549, 395389054254892996, 6101927873439814335, 85761387564101647001

Offset: 1

Author

R. H. Hardin May 22 2013

Keywords

• nonn

Comments

Column 7 of A225982

Examples

			Some solutions for n=3
..0..0..1..1..0..1..1....0..0..0..1..1..1..1....0..0..1..1..1..1..1
..1..0..0..0..1..1..1....0..1..0..0..0..0..0....0..0..1..1..1..0..1
..1..1..0..0..1..1..1....1..1..0..0..0..1..0....1..1..0..1..1..0..1