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A197048 Number of nXn 0..4 arrays with each element equal to the number of its horizontal and vertical zero neighbors 1
1, 2, 10, 42, 358, 4468, 88056, 2745186, 134355866, 10264692132, 1234801357470, 232966546265096, 68939282741912248 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Every 0 is next to 0 0's, every 1 is next to 1 0's, every 2 is next to 2 0's, every 3 is next to 3 0's, every 4 is next to 4 0's

Diagonal of A197054

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

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

..1..1..2..0....0..3..1..0....0..4..0..2....3..0..3..0....1..2..0..3

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

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

CROSSREFS

Sequence in context: A084480 A099553 A119694 * A175613 A121949 A005144

Adjacent sequences:  A197045 A197046 A197047 * A197049 A197050 A197051

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 09 2011

STATUS

approved

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Last modified April 19 00:07 EDT 2014. Contains 240735 sequences.