A299833 Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero.

0, 4, 142, 13850, 5544044, 8606994457, 50892107038125, 1150505978004893314, 99505249795723847465007, 32917701191229121103342743309

Offset

1,2

Comments

Diagonal of A299839.

Links

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

Example

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

Crossrefs

Cf. A299839.

Sequence in context: A210831 A247483 A293752 * A231949 A239248 A390553

Adjacent sequences: A299830 A299831 A299832 * A299834 A299835 A299836

Keyword

nonn

Author

R. H. Hardin, Feb 20 2018

Status

approved