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A301402 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
4, 32, 252, 1988, 15680, 123676, 975492, 7694176, 60687676, 478672964, 3775524480, 29779382108, 234884346116, 1852646097568, 14612713105788, 115257514423492, 909091592704960, 7170443749899164, 56556747398228868, 446090338036896224 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A301407.

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301407.

Sequence in context: A300203 A273053 A303422 * A303416 A007278 A108449

Adjacent sequences:  A301399 A301400 A301401 * A301403 A301404 A301405

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 20 2018

STATUS

approved

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Last modified August 2 12:47 EDT 2021. Contains 346424 sequences. (Running on oeis4.)