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

1,1

Comments

Column 7 of A225982

Links

Table of n, a(n) for n=1..14.

Example

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

Crossrefs

Sequence in context: A224282 A224205 A162994 * A232427 A194496 A297092

Adjacent sequences: A225978 A225979 A225980 * A225982 A225983 A225984

Keyword

nonn

Author

R. H. Hardin May 22 2013

Status

approved