A213695 Half the number of (n+1)X(n+1) symmetric 0..6 arrays with no 2X2 subblock summing to 12.

159, 45892, 84059234, 976919547736, 72037480156866493, 33704464361612549676417, 100056407652480771734417515110

Offset: 1

Author

R. H. Hardin Jun 18 2012

Keywords

• nonn

Comments

Column 6 of A213697

Examples

			Some solutions for n=4
..2..3..5..0..0....4..2..3..3..5....0..5..2..5..0....2..4..1..0..0
..3..2..1..1..2....2..0..3..1..5....5..1..2..2..6....4..1..0..3..6
..5..1..0..2..3....3..3..5..4..4....2..2..3..1..4....1..0..0..0..4
..0..1..2..0..0....3..1..4..4..3....5..2..1..3..1....0..3..0..4..5
..0..2..3..0..5....5..5..4..3..6....0..6..4..1..0....0..6..4..5..1