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A266006 Number of n X n integer arrays with each element equal to the number of horizontal and antidiagonal neighbors equal to itself. 0
1, 1, 6, 9, 70, 473, 10708, 348557, 4845667, 64933909, 9012724549, 927373554115, 90953901974416, 39400271219843985, 17050653134989917553, 3479394369545306732310 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Diagonal of A266012.

LINKS

Table of n, a(n) for n=1..16.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A266012.

Sequence in context: A119738 A299917 A204383 * A103107 A121233 A156180

Adjacent sequences:  A266003 A266004 A266005 * A266007 A266008 A266009

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 2015

STATUS

approved

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Last modified July 31 22:27 EDT 2021. Contains 346377 sequences. (Running on oeis4.)