A297952 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero.

0, 3, 15, 78, 681, 11283, 483929, 22145365, 2092206702, 397080534452

Offset

1,2

Comments

Diagonal of A297959.

Links

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

Example

Some solutions for n=6
..0..1..1..0..0..1. .0..1..1..1..1..0. .0..1..0..1..0..1. .0..1..0..0..1..0
..1..0..0..1..1..0. .0..0..1..1..0..0. .0..1..1..0..1..1. .0..0..1..1..0..1
..0..0..0..1..1..0. .0..0..0..0..0..0. .1..1..0..1..0..0. .0..0..1..1..0..0
..1..1..1..0..1..1. .1..0..1..1..0..1. .1..1..0..1..1..1. .1..0..1..1..0..0
..0..1..1..1..0..0. .0..1..1..1..1..0. .0..1..1..0..1..0. .0..1..0..1..0..1
..0..1..0..0..1..0. .1..0..0..0..0..1. .1..0..1..0..1..0. .1..1..0..1..1..1

Crossrefs

Cf. A297959.

Sequence in context: A125700 A227954 A104530 * A298771 A298576 A299568

Adjacent sequences: A297949 A297950 A297951 * A297953 A297954 A297955

Keyword

nonn

Author

R. H. Hardin, Jan 09 2018

Status

approved