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A304129 Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 6 king-move adjacent elements, with upper left element zero. 1
5, 17, 19, 44, 80, 140, 244, 436, 800, 1444, 2584, 4630, 8328, 15032, 27058, 48590, 87400, 157336, 283092, 509306, 916198, 1648190, 2965634, 5335868, 9599288, 17270130, 31071812, 55902190, 100575652, 180948570, 325547770, 585704612 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A304133.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-3) +a(n-5) -a(n-6) -5*a(n-7) -2*a(n-8) +2*a(n-10) for n>13

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304133.

Sequence in context: A226627 A124873 A129745 * A038964 A019401 A217079

Adjacent sequences:  A304126 A304127 A304128 * A304130 A304131 A304132

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 07 2018

STATUS

approved

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Last modified February 26 00:08 EST 2020. Contains 332270 sequences. (Running on oeis4.)