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

1,1

Comments

Row 5 of A213697

Links

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

Example

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

Crossrefs

Sequence in context: A230575 A251244 A188338 * A224462 A251679 A151628

Adjacent sequences: A213698 A213699 A213700 * A213702 A213703 A213704

Keyword

nonn

Author

R. H. Hardin Jun 18 2012

Status

approved