A298488 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.

1, 7, 20, 41, 178, 388, 628, 1708, 2860, 4002, 9979, 17394, 15401, 63332, 135334, 82102, 702695, 2582167, 1191816, 17532272, 141444005, 38062610

Offset

1,2

Comments

Diagonal of A298494.

Links

Table of n, a(n) for n=1..22.

Example

Some solutions for n=9
..0..0..1..0..0..0..1..1..1. .0..1..1..1..1..0..1..0..0
..1..0..1..0..1..0..1..0..1. .0..0..0..0..0..1..0..1..1
..1..0..0..0..1..1..1..0..0. .1..1..0..0..1..0..1..0..1
..1..0..0..0..1..1..1..0..0. .1..0..0..0..0..1..0..1..1
..1..0..1..0..1..0..1..0..1. .1..1..1..1..1..0..1..0..0
..0..0..1..1..1..0..1..1..1. .0..0..1..1..0..1..0..1..0
..0..0..1..1..1..0..1..1..1. .1..1..1..1..1..0..1..0..0
..1..0..1..0..1..0..1..0..1. .1..0..0..0..0..1..0..1..1
..0..0..1..1..1..0..1..1..1. .1..1..0..0..1..0..1..0..1

Crossrefs

Cf. A298494.

Sequence in context: A100752 A162024 A143058 * A175428 A232599 A011934

Adjacent sequences: A298485 A298486 A298487 * A298489 A298490 A298491

Keyword

nonn

Author

R. H. Hardin, Jan 20 2018

Status

approved