

A197048


Number of n X n 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



