A263868 Number of (n+1)X(n+1) 0..1 arrays with each row and column divisible by 3, read as a binary number with top and left being the most significant bits, and rows and columns lexicographically nondecreasing.

2, 2, 7, 7, 61, 379, 62904, 16701495

Offset

1,1

Comments

Diagonal of A263873.

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..1..1..1..1....0..0..0..1..1....0..0..0..0..0....0..0..0..1..1
..0..1..1..1..1....0..0..0..1..1....0..0..0..0..0....0..0..0..1..1
..0..1..1..1..1....0..1..1..1..1....0..0..0..1..1....0..0..0..1..1
..0..1..1..1..1....0..1..1..1..1....0..0..0..1..1....0..0..0..1..1

Crossrefs

Cf. A263873.

Sequence in context: A117779 A300952 A195326 * A263793 A232647 A091665

Adjacent sequences: A263865 A263866 A263867 * A263869 A263870 A263871

Keyword

nonn

Author

R. H. Hardin, Oct 28 2015

Status

approved