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A266133 Number of 3Xn integer arrays with each element equal to the number of horizontal, diagonal and antidiagonal neighbors exactly one smaller than itself. 1
1, 20, 77, 117, 278, 1959, 11044, 36730, 123887, 598383, 2919993, 11429093, 43919671, 194434626, 880889564, 3627851352, 14690154222, 63196827262, 276336307138, 1159331148853, 4807640087709, 20468995961561, 88006303609494 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Row 3 of A266131.
LINKS
FORMULA
Empirical recurrence of order 77 (see link above)
EXAMPLE
Some solutions for n=4
..1..1..1..1....1..2..0..0....2..1..1..2....1..2..0..1....2..1..2..0
..1..0..0..2....1..0..0..0....0..1..1..0....1..0..2..0....1..1..0..0
..0..2..1..1....1..1..2..1....2..1..1..2....1..1..0..0....1..0..2..1
CROSSREFS
Cf. A266131.
Sequence in context: A066126 A228025 A219941 * A083127 A211613 A292360
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 21 2015
STATUS
approved

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Last modified July 23 18:56 EDT 2024. Contains 374553 sequences. (Running on oeis4.)