A213701 Half the number of 6X6 0..n symmetric arrays with no 2X2 subblock summing to 2n.

5148, 168382284, 193946752094, 34389632236877, 2256314178023600, 72037480156866493, 1425762604012263360, 19265705246048238885, 196522537519121864954, 1582723194473524459497, 10592676749133340851406

Offset: 1

Author

R. H. Hardin Jun 18 2012

Keywords

• nonn

Comments

Row 5 of A213697

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..15