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A269182 Number of nX4 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three exactly once. 1
108, 2736, 80112, 2097552, 52394312, 1265974992, 29881402560, 693021071760, 15854541802056, 358760880894864, 8045649521280080, 179088561311942528, 3961164069598726264, 87139967884594089296, 1907940856141713336608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A269186.

LINKS

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

FORMULA

Empirical: a(n) = 46*a(n-1) -607*a(n-2) +1264*a(n-3) +11029*a(n-4) -27640*a(n-5) -86627*a(n-6) +153412*a(n-7) +308464*a(n-8) -329306*a(n-9) -438615*a(n-10) +260680*a(n-11) +134834*a(n-12) -65824*a(n-13) -9889*a(n-14) +5080*a(n-15) -400*a(n-16) for n>17

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Cf. A269186.

Sequence in context: A183357 A264681 A221018 * A244877 A223153 A203028

Adjacent sequences:  A269179 A269180 A269181 * A269183 A269184 A269185

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2016

STATUS

approved

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Last modified June 20 19:33 EDT 2019. Contains 324234 sequences. (Running on oeis4.)