A318344 Number of nXn 0..1 arrays with every element unequal to 0, 1, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 6, 14, 62, 345, 2429, 27666, 463096, 11104161, 397131064, 21043166129, 1628448853753, 185201538620856, 31011863120228186, 7625923325942095846, 2753956957835485482236

Offset

1,2

Comments

Diagonal of A318350.

Links

Table of n, a(n) for n=1..17.

Example

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

Crossrefs

Cf. A318350.

Sequence in context: A059741 A054099 A257320 * A129090 A324222 A058141

Adjacent sequences: A318341 A318342 A318343 * A318345 A318346 A318347

Keyword

nonn

Author

R. H. Hardin, Aug 24 2018

Status

approved