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A269147 Number of nX3 0..3 arrays with some element plus some horizontally, antidiagonally or vertically adjacent neighbor totalling three exactly once. 1
24, 768, 13904, 220968, 3277728, 46576336, 642676704, 8680278136, 115349343264, 1513379596864, 19651887694240, 253030595298696, 3234828051983328, 41105657832397744, 519625334069189984, 6539008095907322520 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A269152.

LINKS

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

FORMULA

Empirical: a(n) = 26*a(n-1) -199*a(n-2) +408*a(n-3) -463*a(n-4) +322*a(n-5) -141*a(n-6) +36*a(n-7) -4*a(n-8) for n>9

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A269152.

Sequence in context: A062528 A175604 A283873 * A269209 A270252 A275635

Adjacent sequences: A269144 A269145 A269146 * A269148 A269149 A269150

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2016

STATUS

approved

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Last modified February 8 15:15 EST 2023. Contains 360149 sequences. (Running on oeis4.)