A300765 Number of nX4 0..1 arrays with every element equal to 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

2, 15, 33, 91, 247, 728, 2042, 5974, 17545, 51551, 151557, 446408, 1314475, 3869787, 11400978, 33619541, 99210170, 292931867, 865301600, 2556823741, 7556496705, 22335732398, 66027826136, 195206654273, 577164023144, 1706621739932

Offset

1,1

Comments

Column 4 of A300769.

Links

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

Example

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

Crossrefs

Cf. A300769.

Sequence in context: A243469 A366330 A300431 * A300635 A301357 A271909

Adjacent sequences: A300762 A300763 A300764 * A300766 A300767 A300768

Keyword

nonn

Author

R. H. Hardin, Mar 12 2018

Status

approved