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A304342 Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero. 1
4, 14, 27, 71, 225, 613, 1752, 5102, 14673, 42235, 122016, 352304, 1016793, 2936025, 8478588, 24482962, 70700917, 204172771, 589619638, 1702740928, 4917307073, 14200615673, 41009800440, 118431859204, 342018606381, 987713762163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A304347.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +3*a(n-2) +6*a(n-3) -11*a(n-4) -25*a(n-5) -27*a(n-6) +19*a(n-7) +61*a(n-8) +59*a(n-9) -39*a(n-11) -13*a(n-12) -14*a(n-13) -20*a(n-14) -24*a(n-15) for n>16

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304347.

Sequence in context: A175680 A094320 A200546 * A066907 A130439 A289179

Adjacent sequences:  A304339 A304340 A304341 * A304343 A304344 A304345

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 11 2018

STATUS

approved

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Last modified March 23 05:36 EDT 2019. Contains 321422 sequences. (Running on oeis4.)