A266018 - OEIS

A266018

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

1, 7, 33, 577, 39064, 4285397, 1577145547, 1561479265416

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OFFSET

1,2

COMMENTS

Diagonal of A266025.

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

..2..1..0..0....1..1..1..0....1..1..1..0....1..0..2..0....1..1..2..0

..1..2..0..0....0..1..1..2....0..1..1..1....2..1..1..2....0..2..1..2

..0..0..2..1....2..1..1..0....1..1..1..1....2..1..1..2....0..2..1..0

..0..0..1..2....0..1..1..1....2..0..2..0....0..2..0..1....0..2..1..1

CROSSREFS

Cf. A266025.

Sequence in context: A197565 A202762 A202757 * A001795 A336277 A209897

Adjacent sequences: A266015 A266016 A266017 * A266019 A266020 A266021

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2015

STATUS

approved