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A300467 Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 1
4, 29, 160, 925, 5363, 31106, 180397, 1046223, 6067629, 35189573, 204083997, 1183597158, 6864341406, 39810152164, 230881321531, 1339009818730, 7765666285883, 45037438874738, 261197278600938, 1514828996788371 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A300472.

LINKS

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

FORMULA

Empirical: a(n) = 6*a(n-1) -a(n-2) -a(n-3) +a(n-4) -4*a(n-5) +a(n-6) -a(n-7)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A300472.

Sequence in context: A302260 A302960 A273300 * A326100 A273209 A273271

Adjacent sequences:  A300464 A300465 A300466 * A300468 A300469 A300470

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 06 2018

STATUS

approved

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Last modified June 27 23:11 EDT 2022. Contains 354903 sequences. (Running on oeis4.)