A303718 Number of n X 7 0..1 arrays with every element unequal to 0, 1 or 5 king-move adjacent elements, with upper left element zero.

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

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 A335189 A304269

Adjacent sequences: A303715 A303716 A303717 * A303719 A303720 A303721

Keyword

nonn

Author

R. H. Hardin, Apr 29 2018

Status

approved