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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 * A372412 A103107 A370623 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 May 18 12:18 EDT 2024. Contains 372630 sequences. (Running on oeis4.)