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A305342 Number of nX3 0..1 arrays with every element unequal to 0, 1, 3, 5 or 8 king-move adjacent elements, with upper left element zero. 2
3, 9, 14, 28, 63, 126, 245, 505, 1037, 2088, 4230, 8613, 17472, 35423, 71929, 146011, 296248, 601240, 1220345, 2476606, 5026129, 10200761, 20702551, 42015462, 85270560, 173057285, 351219532, 712800109, 1446630113, 2935938275, 5958489786 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A305347.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-3) +2*a(n-4) +a(n-5) +a(n-6) -a(n-7) -a(n-8) -a(n-9) -a(n-11) -a(n-12)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305347.

Sequence in context: A195972 A274435 A136562 * A197274 A316234 A317155

Adjacent sequences:  A305339 A305340 A305341 * A305343 A305344 A305345

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 30 2018

STATUS

approved

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Last modified October 19 11:49 EDT 2021. Contains 348088 sequences. (Running on oeis4.)