A233891 Number of (n+1)X(7+1) 0..6 arrays with every 2X2 subblock having the sum of the squares of the edge differences equal to 30, and no two adjacent values equal.

161168, 5829956, 197246776, 8442821772, 317752132336, 13755592501748, 530020280813856, 22858877905193252, 889603831608487232, 38192457821678629076, 1495266348359989393168, 63945337592938269038024

Offset

1,1

Comments

Column 7 of A233892

Links

R. H. Hardin, Table of n, a(n) for n = 1..51

Example

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

Crossrefs

Sequence in context: A017393 A017657 A235256 * A339498 A249880 A343967

Adjacent sequences: A233888 A233889 A233890 * A233892 A233893 A233894

Keyword

nonn

Author

R. H. Hardin, Dec 17 2013

Status

approved