A297900 Number of n X n 0..1 arrays with every element equal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.

1, 4, 1, 37, 281, 257, 23911, 1367645, 10485521, 4553534006

Offset

1,2

Comments

Diagonal of A297907.

Links

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

Example

Some solutions for n=7
..0..0..1..0..0..1..0. .0..1..0..1..1..0..1. .0..0..1..1..0..0..0
..1..1..1..1..1..1..1. .0..1..0..1..1..0..1. .0..0..0..0..0..1..1
..0..0..1..0..0..1..0. .1..1..0..0..1..0..0. .1..1..1..1..0..1..1
..0..0..1..0..0..1..0. .1..1..0..0..1..1..0. .1..1..0..1..1..0..0
..0..1..1..1..0..1..1. .0..1..0..1..1..0..1. .0..0..0..0..1..0..0
..0..0..1..0..0..1..0. .1..1..0..0..1..0..0. .1..1..0..1..1..0..1
..1..0..0..1..0..0..1. .1..1..0..0..1..0..0. .1..1..0..1..1..0..1

Crossrefs

Cf. A297907.

Sequence in context: A169656 A362589 A303987 * A363819 A298495 A373827

Adjacent sequences: A297897 A297898 A297899 * A297901 A297902 A297903

Keyword

nonn

Author

R. H. Hardin, Jan 08 2018

Status

approved