A299938 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 3, 6, 7 or 8 king-move adjacent elements, with upper left element zero.

1, 8, 70, 649, 8379, 124748, 2237911, 57942564, 2226744922, 121611666154, 12022143900385

Offset

1,2

Comments

Diagonal of A299942.

Links

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

Example

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

Crossrefs

Cf. A299942.

Sequence in context: A298281 A299355 A299175 * A152263 A142986 A123511

Adjacent sequences: A299935 A299936 A299937 * A299939 A299940 A299941

Keyword

nonn

Author

R. H. Hardin, Feb 22 2018

Status

approved