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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
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 * A372412 A103107 A370623
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 20 2015
STATUS
approved

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Last modified May 18 12:18 EDT 2024. Contains 372630 sequences. (Running on oeis4.)