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A269203 Number of 3Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three no more than once. 1
64, 1740, 25572, 400428, 5877228, 84310620, 1184381844, 16385570076, 223935582828, 3030348558252, 40673437553748, 542180347359564, 7185077761974828, 94737850175764476, 1243661129422894356 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A269201.

LINKS

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

FORMULA

Empirical: a(n) = 24*a(n-1) -130*a(n-2) -248*a(n-3) +935*a(n-4) +272*a(n-5) -1768*a(n-6) +960*a(n-7) -144*a(n-8)

EXAMPLE

Some solutions for n=3

..1..3..3. .1..3..1. .1..2..0. .0..0..0. .2..0..3. .1..1..1. .3..3..3

..3..1..1. .2..3..2. .3..1..0. .0..1..1. .1..3..1. .3..1..3. .3..3..3

..1..1..3. .2..3..1. .3..2..0. .3..3..3. .2..0..1. .1..2..0. .2..3..1

CROSSREFS

Cf. A269201.

Sequence in context: A269660 A234240 A017115 * A005609 A065788 A264275

Adjacent sequences:  A269200 A269201 A269202 * A269204 A269205 A269206

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2016

STATUS

approved

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Last modified April 26 08:11 EDT 2019. Contains 322472 sequences. (Running on oeis4.)