A266021 Number of nX4 integer arrays with each element equal to the number of horizontal, vertical and antidiagonal neighbors exactly one smaller than itself.

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

R. H. Hardin, Table of n, a(n) for n = 1..210

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

Adjacent sequences: A266018 A266019 A266020 * A266022 A266023 A266024

Keyword

nonn

Author

R. H. Hardin, Dec 20 2015

Status

approved