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URL: https://oeis.org/A195970

⇱ A195970 - OEIS

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A195970
Number of n X n 0..4 arrays with each element x equal to the number of its horizontal and vertical neighbors equal to 2,0,1,3,4 for x=0,1,2,3,4.
0
1, 9, 24, 67, 244, 1280, 5637, 32909, 212185, 1609756, 13476199, 134461394
OFFSET
1,2
COMMENTS
Every 0 is next to 0 2's, every 1 is next to 1 0's, every 2 is next to 2 1's, every 3 is next to 3 3's, every 4 is next to 4 4's
Diagonal of A195978
EXAMPLE
Some solutions for n=4
..1..0..0..1....1..2..2..1....1..0..1..1....1..0..1..1....1..0..0..0
..1..0..0..1....0..1..1..0....1..1..1..0....2..1..1..0....2..1..1..1
..1..0..0..1....0..1..1..1....0..1..1..0....2..1..1..0....2..1..1..1
..1..0..0..1....1..1..0..1....0..1..1..0....1..0..1..1....1..0..0..0
CROSSREFS
Sequence in context: A297225 A258438 A038626 * A223372 A180334 A223290
KEYWORD
nonn
AUTHOR
R. H. Hardin, Sep 25 2011
STATUS
approved