A213703 Half the number of 8X8 0..n symmetric arrays with no 2X2 subblock summing to 2n.

1220409, 109492322533385, 22678299640600736258, 181744271406372884215557, 251417716503635583550380605, 100056407652480771734417515110

Offset: 1

Author

R. H. Hardin Jun 18 2012

Keywords

• nonn

Comments

Row 7 of A213697

Examples

			Some solutions for n=4
..1..3..0..2..3..4..4..3....3..0..4..4..0..2..3..0....3..4..3..0..0..1..2..3
..3..2..1..3..3..4..3..4....0..4..1..1..2..1..0..0....4..3..4..2..3..0..1..4
..0..1..0..0..3..0..0..0....4..1..1..4..2..4..4..3....3..4..3..3..1..3..0..2
..2..3..0..3..1..0..2..2....4..1..4..3..2..3..0..4....0..2..3..2..1..4..2..3
..3..3..3..1..4..4..3..4....0..2..2..2..2..0..2..1....0..3..1..1..3..1..0..1
..4..4..0..0..4..2..4..1....2..1..4..3..0..4..0..1....1..0..3..4..1..4..2..3
..4..3..0..2..3..4..1..1....3..0..4..0..2..0..2..4....2..1..0..2..0..2..2..3
..3..4..0..2..4..1..1..0....0..0..3..4..1..1..4..0....3..4..2..3..1..3..3..4