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A303964 Number of nX3 0..1 arrays with every element unequal to 0, 1, 3 or 5 king-move adjacent elements, with upper left element zero. 2
3, 9, 13, 26, 54, 101, 186, 361, 700, 1340, 2562, 4913, 9427, 18084, 34674, 66476, 127478, 244485, 468836, 899014, 1723966, 3305986, 6339698, 12157161, 23312919, 44705673, 85729179, 164397103, 315253197, 604539962, 1159286107, 2223085660 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A303969.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-3) +2*a(n-4) +a(n-5) +a(n-6) -a(n-7) -a(n-11) -a(n-12)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303969.

Sequence in context: A113510 A163795 A079994 * A124825 A074938 A057260

Adjacent sequences:  A303961 A303962 A303963 * A303965 A303966 A303967

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 03 2018

STATUS

approved

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Last modified August 10 06:08 EDT 2022. Contains 356029 sequences. (Running on oeis4.)