A298555 Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 4, 56, 956, 24364, 983554, 58699120, 5376664548, 755503324152

Offset

1,2

Comments

Diagonal of A298560.

Links

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

Example

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

Crossrefs

Cf. A298560.

Sequence in context: A222687 A111874 A297944 * A240298 A298383 A326289

Adjacent sequences: A298552 A298553 A298554 * A298556 A298557 A298558

Keyword

nonn

Author

R. H. Hardin, Jan 21 2018

Status

approved