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A299182 Number of nX3 0..1 arrays with every element equal to 0, 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 2
4, 13, 20, 27, 47, 83, 137, 235, 412, 709, 1228, 2150, 3758, 6578, 11556, 20330, 35805, 63163, 111574, 197307, 349294, 618999, 1098034, 1949511, 3464203, 6160917, 10965304, 19530386, 34810655, 62087577, 110808092, 197881858, 353585148 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A299187.

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -a(n-2) +3*a(n-3) -14*a(n-4) +a(n-5) +4*a(n-6) +23*a(n-7) +3*a(n-8) -10*a(n-9) -21*a(n-10) -4*a(n-11) +3*a(n-13) +a(n-14) +6*a(n-15) +6*a(n-16) +4*a(n-17) for n>19

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A299187.

Sequence in context: A297884 A298289 A298489 * A030744 A173512 A295159

Adjacent sequences:  A299179 A299180 A299181 * A299183 A299184 A299185

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 04 2018

STATUS

approved

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Last modified September 22 19:36 EDT 2021. Contains 347608 sequences. (Running on oeis4.)