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A233725 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 6 and no adjacent elements equal 0
40, 756, 29816, 2723072, 578163016, 297173770244, 365411698279744, 1098248392267801764, 7928574480658025834472, 139889299008340046298542520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A233733

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=3

..1..3..2..3....3..1..3..2....0..1..3..1....0..1..3..2....2..0..2..0

..0..1..0..1....2..0..1..3....2..0..2..0....2..0..2..0....3..2..3..2

..3..2..3..2....3..1..3..2....3..1..3..1....3..1..3..1....2..0..2..0

..0..1..0..1....1..0..1..0....1..0..2..3....1..0..2..0....0..1..0..1

CROSSREFS

Sequence in context: A189286 A160445 A010840 * A175603 A319308 A022073

Adjacent sequences:  A233722 A233723 A233724 * A233726 A233727 A233728

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2013

STATUS

approved

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Last modified July 30 05:44 EDT 2021. Contains 346349 sequences. (Running on oeis4.)