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A303718 Number of nX7 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero. 1
21, 23, 40, 161, 361, 741, 1592, 3469, 7416, 15880, 34193, 73457, 157645, 338676, 727589, 1562584, 3356196, 7209121, 15484337, 33258365, 71436088, 153437805, 329568008, 707878984, 1520453793, 3265780153, 7014565013, 15066579716 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 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) for n>9

EXAMPLE

Some solutions for n=5

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

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

..0..0..0..0..0..0..0. .0..0..0..0..0..0..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..0..0

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

CROSSREFS

Cf. A303719.

Sequence in context: A229221 A157676 A227948 * A270108 A304269 A302679

Adjacent sequences:  A303715 A303716 A303717 * A303719 A303720 A303721

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 29 2018

STATUS

approved

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Last modified November 13 07:13 EST 2019. Contains 329085 sequences. (Running on oeis4.)