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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

R. H. Hardin, Table of n, a(n) for n = 1..210

R. H. Hardin, Empirical recurrence of order 77

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

Adjacent sequences:  A266130 A266131 A266132 * A266134 A266135 A266136

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 21 2015

STATUS

approved

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Last modified November 29 06:00 EST 2021. Contains 349416 sequences. (Running on oeis4.)