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A303715 Number of nX4 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero. 1
5, 5, 8, 17, 36, 76, 161, 349, 749, 1604, 3449, 7412, 15912, 34177, 73421, 157693, 338696, 727505, 1562612, 3356300, 7209009, 15484261, 33258581, 71436052, 153437513, 329568260, 707879240, 1520453249, 3265780149, 7014565813 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A303719.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +a(n-2) +3*a(n-3) +a(n-4) -a(n-5) -a(n-6)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303719.

Sequence in context: A218333 A212533 A081287 * A204188 A019843 A046567

Adjacent sequences:  A303712 A303713 A303714 * A303716 A303717 A303718

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 29 2018

STATUS

approved

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Last modified October 22 22:34 EDT 2019. Contains 328335 sequences. (Running on oeis4.)