A213702 Half the number of 7X7 0..n symmetric arrays with no 2X2 subblock summing to 2n.

68798, 88681187619, 1146407046198040, 1199143411128185584, 325754552781442854792, 33704464361612549676417, 1829651398830137742302620, 59594337869095766240501287, 1329775905386553460207679334

Offset: 1

Author

R. H. Hardin Jun 18 2012

Keywords

• nonn

Comments

Row 6 of A213697

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..10