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A298489 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero. 1
4, 13, 20, 27, 43, 70, 106, 169, 276, 444, 720, 1183, 1947, 3207, 5311, 8826, 14681, 24474, 40897, 68419, 114596, 192212, 322715, 542258, 911962, 1534860, 2584781, 4355511, 7343271, 12386305, 20901774, 35285703, 59589460, 100666009, 170109263 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A298494.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -2*a(n-2) +3*a(n-3) -9*a(n-4) +4*a(n-5) -a(n-6) +9*a(n-7) -3*a(n-8) -a(n-9) -4*a(n-10) +2*a(n-11) for n>12

EXAMPLE

Some solutions for n=9

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

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

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

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

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

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

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

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

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

CROSSREFS

Cf. A298494.

Sequence in context: A066993 A297884 A298289 * A299182 A030744 A173512

Adjacent sequences:  A298486 A298487 A298488 * A298490 A298491 A298492

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 20 2018

STATUS

approved

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Last modified October 18 11:19 EDT 2021. Contains 348067 sequences. (Running on oeis4.)