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A303416 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
4, 32, 252, 1988, 15684, 123732, 976132, 7700788, 60752164, 479278932, 3781071812, 29829193588, 235325017444, 1856498858132, 14646075660292, 115544122910388, 911537305199524, 7191194479141332, 56731938168469572, 447563032495731188 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A303421.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +6*a(n-2) +8*a(n-3)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303421.

Sequence in context: A273053 A303422 A301402 * A007278 A108449 A213413

Adjacent sequences:  A303413 A303414 A303415 * A303417 A303418 A303419

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 23 2018

STATUS

approved

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Last modified July 28 00:54 EDT 2021. Contains 346316 sequences. (Running on oeis4.)