A318033 Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

5, 11, 25, 69, 176, 472, 1222, 3354, 9209, 25092, 69048, 189937, 522701, 1439639, 3967466, 10934482, 30136689, 83080184, 229038227, 631457554, 1741022135, 4800335088, 13235718591, 36494509188, 100626366718, 277458546176

Offset

1,1

Comments

Column 4 of A318037.

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

Crossrefs

Cf. A318037.

Sequence in context: A355243 A018368 A050344 * A326161 A354838 A038253

Adjacent sequences: A318030 A318031 A318032 * A318034 A318035 A318036

Keyword

nonn

Author

R. H. Hardin, Aug 13 2018

Status

approved