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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 0
160, 3944, 194208, 26954304, 7752002928, 6709328689904, 11458028594887856, 63725861037698186808 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A233917
LINKS
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
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 17 2013
STATUS
approved

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Last modified May 22 06:48 EDT 2024. Contains 372743 sequences. (Running on oeis4.)