A300371 Number of nX7 0..1 arrays with every element equal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 6, 16, 39, 270, 1592, 12042, 75739, 490425, 3084820, 19634393, 129519588, 829432020, 5341866361, 34667291397, 223006749453, 1438573920539, 9290258941352, 59927615962595, 386783857393798, 2495707675837699

Offset

1,2

Comments

Column 7 of A300372.

Links

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

Example

Some solutions for n=5
..0..0..0..0..0..0..0. .0..0..0..0..1..1..0. .0..0..0..0..1..1..0
..0..1..1..1..1..1..0. .0..1..1..0..1..0..0. .0..1..1..0..1..0..0
..1..0..0..1..0..1..0. .1..1..0..1..0..1..0. .0..1..0..0..1..1..1
..1..0..0..0..0..1..0. .0..0..1..0..1..1..0. .0..0..1..1..0..0..1
..1..1..1..1..1..0..0. .0..1..1..0..0..0..0. .0..1..1..0..0..1..1

Crossrefs

Cf. A300372.

Sequence in context: A092274 A068941 A130902 * A009955 A160255 A213667

Adjacent sequences: A300368 A300369 A300370 * A300372 A300373 A300374

Keyword

nonn

Author

R. H. Hardin, Mar 04 2018

Status

approved