A300109 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

0, 3, 15, 112, 3776, 346593, 87633085, 55075362479, 98018916520293

Offset

1,2

Comments

Diagonal of A300115.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A300115.

Sequence in context: A298390 A299508 A299308 * A056053 A295758 A343707

Adjacent sequences: A300106 A300107 A300108 * A300110 A300111 A300112

Keyword

nonn

Author

R. H. Hardin, Feb 25 2018

Status

approved