A299091 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

1, 7, 20, 125, 2828, 42012, 2170819, 161247816, 20536604982, 5567500327979

Offset

1,2

Comments

Diagonal of A299097.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A299097.

Sequence in context: A298214 A299346 A009370 * A299873 A009372 A051102

Adjacent sequences: A299088 A299089 A299090 * A299092 A299093 A299094

Keyword

nonn

Author

R. H. Hardin, Feb 02 2018

Status

approved