

A279129


Number of nX3 0..1 arrays with no element equal to a strict majority of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.


1



0, 9, 66, 256, 820, 2551, 7491, 21131, 57971, 155551, 409876, 1064002, 2727560, 6917391, 17381168, 43320628, 107203164, 263611545, 644549767, 1567944409, 3796630655, 9154650571, 21989697066, 52634342562, 125577952504, 298716701553
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OFFSET

1,2


COMMENTS

Column 3 of A279134.


LINKS

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


FORMULA

Empirical: a(n) = 6*a(n1) 11*a(n2) +5*a(n3) +a(n5) +9*a(n6) 6*a(n7) +3*a(n8) 5*a(n9) a(n11) for n>17


EXAMPLE

Some solutions for n=4
..0..1..1. .0..1..0. .0..1..0. .0..1..1. .0..0..1. .0..0..1. .0..1..0
..0..1..0. .0..0..1. .0..1..0. .1..0..0. .1..1..1. .1..0..0. .0..1..0
..1..0..0. .1..0..1. .1..0..0. .1..0..1. .1..0..0. .0..1..1. .0..1..0
..0..1..0. .0..0..0. .0..1..1. .1..1..0. .0..1..1. .1..0..1. .1..0..1


CROSSREFS

Cf. A279134.
Sequence in context: A152581 A122733 A118465 * A051375 A081902 A002695
Adjacent sequences: A279126 A279127 A279128 * A279130 A279131 A279132


KEYWORD

nonn


AUTHOR

R. H. Hardin, Dec 06 2016


STATUS

approved



