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A269190 Number of nX4 0..3 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling three no more than once. 1
216, 4476, 115452, 2817548, 67134380, 1567933676, 36068275268, 819789099172, 18452018423420, 411983259384452, 9136178140885388, 201433537180523700, 4419013543755451812, 96521322466937887324, 2100165198065619059932 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A269194.

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

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

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

CROSSREFS

Cf. A269194.

Sequence in context: A183785 A282019 A017343 * A017463 A183617 A114060

Adjacent sequences:  A269187 A269188 A269189 * A269191 A269192 A269193

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 20 2016

STATUS

approved

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Last modified February 25 02:54 EST 2020. Contains 332217 sequences. (Running on oeis4.)