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A266021
Number of nX4 integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself.
1
5, 42, 91, 577, 3796, 19688, 110924, 656555, 3732300, 21344656, 123330565, 708246405, 4066193034, 23408646708, 134627655119, 773992993358, 4452175085918, 25607065587568, 147270467464058, 847048745101385
OFFSET
1,1
COMMENTS
Column 4 of A266025.
LINKS
EXAMPLE
Some solutions for n=4
..1..0..0..1....0..0..1..1....0..1..1..0....0..0..1..1....0..2..1..0
..1..2..1..1....0..2..2..0....2..3..2..0....0..2..2..0....0..1..1..1
..2..2..2..0....1..2..0..0....1..2..1..2....1..3..2..1....2..1..1..1
..1..0..0..0....1..0..0..0....0..2..1..0....1..0..1..2....0..2..0..1
CROSSREFS
Cf. A266025.
Sequence in context: A025173 A222474 A327269 * A062021 A241780 A215785
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 20 2015
STATUS
approved