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A196422
Number of n X n 0..4 arrays with each element equal to the number of its horizontal and vertical neighbors less than itself.
0
1, 23, 1377, 1436945, 9212529925, 474961518391793, 200900509921996396385
OFFSET
1,2
COMMENTS
Diagonal of A196430.
EXAMPLE
Some solutions for n=3
..0..0..1....0..2..0....1..0..1....0..1..2....0..0..0....2..0..0....1..2..1
..0..0..1....0..4..2....1..0..1....0..1..1....3..2..0....1..0..0....0..4..0
..2..0..2....2..0..0....1..0..1....1..1..0....0..3..1....1..0..0....1..2..1
CROSSREFS
Cf. A196430.
Sequence in context: A201309 A049003 A268961 * A351508 A248703 A264903
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 02 2011
STATUS
approved