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A281797 Number of nX3 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards. 1
0, 6, 75, 324, 865, 2272, 5191, 11141, 22705, 44611, 85366, 160212, 296306, 541784, 981579, 1764938, 3153155, 5602160, 9905073, 17437719, 30580597, 53442733, 93101164, 161719796, 280165812, 484172898, 834830159, 1436409132, 2466624753 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A281802.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -12*a(n-2) +5*a(n-3) +12*a(n-4) -12*a(n-5) -3*a(n-6) +6*a(n-7) -a(n-9) for n>16

EXAMPLE

Some solutions for n=4

..0..0..0. .0..1..0. .0..0..0. .0..1..1. .0..0..0. .0..0..1. .0..1..1

..0..0..1. .0..0..1. .1..0..0. .0..0..1. .0..0..1. .0..1..1. .1..0..1

..0..1..0. .0..0..0. .0..1..1. .1..0..0. .0..0..1. .1..0..1. .1..1..0

..0..0..1. .0..0..0. .1..0..0. .0..0..0. .0..0..0. .1..1..1. .1..0..0

CROSSREFS

Cf. A281802.

Sequence in context: A069852 A266574 A258270 * A049235 A129031 A234529

Adjacent sequences:  A281794 A281795 A281796 * A281798 A281799 A281800

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 30 2017

STATUS

approved

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Last modified November 14 00:05 EST 2019. Contains 329106 sequences. (Running on oeis4.)