A299175 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.

1, 8, 70, 649, 8368, 123258, 2207509, 56481101, 2090883077, 106695657776, 7917434629718

Offset

1,2

Comments

Diagonal of A299180.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A299180.

Sequence in context: A266361 A298281 A299355 * A299938 A152263 A142986

Adjacent sequences: A299172 A299173 A299174 * A299176 A299177 A299178

Keyword

nonn

Author

R. H. Hardin, Feb 04 2018

Status

approved