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A297818 Number of nX3 0..1 arrays with every element equal to 1, 2 or 3 king-move adjacent elements, with upper left element zero. 1
1, 17, 48, 146, 399, 1114, 3124, 8861, 25130, 71196, 201467, 570100, 1613454, 4566805, 12926144, 36586306, 103553095, 293094410, 829569532, 2348002541, 6645755138, 18810052924, 53239705819, 150688904948, 426507740022 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A297823.

LINKS

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

FORMULA

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

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A297823.

Sequence in context: A159850 A031122 A051869 * A297988 A210372 A239130

Adjacent sequences:  A297815 A297816 A297817 * A297819 A297820 A297821

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2018

STATUS

approved

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Last modified April 24 12:01 EDT 2019. Contains 322429 sequences. (Running on oeis4.)