A299308 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 15, 112, 3463, 270346, 60731972, 30975700202, 44405195921475

Offset

1,2

Comments

Diagonal of A299314.

Links

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

Example

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

Crossrefs

Cf. A299314.

Sequence in context: A058104 A298390 A299508 * A300109 A056053 A295758

Adjacent sequences: A299305 A299306 A299307 * A299309 A299310 A299311

Keyword

nonn

Author

R. H. Hardin, Feb 06 2018

Status

approved