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A317736 Number of nX3 0..1 arrays with every element unequal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 2
0, 1, 1, 3, 2, 4, 6, 14, 14, 22, 43, 68, 82, 147, 246, 360, 516, 888, 1385, 2046, 3165, 5185, 7888, 11991, 18930, 29960, 45643, 70736, 111396, 173435, 266587, 416156, 650940, 1008681, 1561889, 2439244, 3797561, 5886887, 9150037, 14265005, 22165953 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

Column 3 of A317741.

LINKS

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

FORMULA

Empirical: a(n) = -a(n-1) -a(n-2) +2*a(n-3) +7*a(n-4) +7*a(n-5) +4*a(n-6) -5*a(n-7) -10*a(n-8) -9*a(n-9) -3*a(n-10) for n>13

EXAMPLE

All solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A317741.

Sequence in context: A085346 A121861 A338213 * A060006 A123097 A209706

Adjacent sequences:  A317733 A317734 A317735 * A317737 A317738 A317739

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 05 2018

STATUS

approved

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Last modified April 19 22:40 EDT 2021. Contains 343117 sequences. (Running on oeis4.)