A300209 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 228, 22194, 7452385, 8664017314, 34824178698922, 483558835111191345, 23194796188589638077072

Offset

1,2

Comments

Diagonal of A300215.

Links

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

Example

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

Crossrefs

Cf. A300215.

Sequence in context: A320365 A317559 A302735 * A300798 A240299 A222525

Adjacent sequences: A300206 A300207 A300208 * A300210 A300211 A300212

Keyword

nonn

Author

R. H. Hardin, Feb 28 2018

Status

approved