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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

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

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Last modified May 14 19:38 EDT 2021. Contains 343902 sequences. (Running on oeis4.)