A233909 Number of (n+1)X(n+1) 0..7 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 30, and no two adjacent values equal

160, 3944, 194208, 26954304, 7752002928, 6709328689904, 11458028594887856, 63725861037698186808

Offset

1,1

Comments

Diagonal of A233917

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=3
..4..0..4..6....6..5..6..2....6..2..3..6....0..1..4..1....4..2..1..5
..1..2..5..2....4..1..4..1....7..4..7..5....2..5..3..5....3..6..3..2
..4..0..1..0....3..5..6..5....3..2..3..6....0..4..0..4....7..5..7..4
..2..3..5..3....4..1..3..7....1..5..1..5....2..1..2..5....3..6..3..2

Crossrefs

Sequence in context: A189351 A168527 A185492 * A035825 A183769 A190937

Adjacent sequences: A233906 A233907 A233908 * A233910 A233911 A233912

Keyword

nonn

Author

R. H. Hardin, Dec 17 2013

Status

approved