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A297988 Number of nX3 0..1 arrays with every element equal to 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero. 4
1, 17, 48, 146, 424, 1274, 3820, 11529, 34783, 104826, 315711, 950990, 2864947, 8631274, 26003209, 78338270, 236004118, 710993764, 2141965614, 6452965003, 19440438745, 58566971613, 176440981687, 531552505076, 1601374384608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A297993.

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) +6*a(n-4) +4*a(n-6) -2*a(n-8) -a(n-9) -2*a(n-10) -2*a(n-11) for n>13

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A297993.

Sequence in context: A031122 A051869 A297818 * A210372 A239130 A181426

Adjacent sequences:  A297985 A297986 A297987 * A297989 A297990 A297991

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2018

STATUS

approved

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Last modified March 26 00:45 EDT 2019. Contains 321479 sequences. (Running on oeis4.)