A300960 Number of n X n 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 3, 16, 327, 15861, 2472677, 1111779576, 1357319826867, 4569367213244153, 42289687408658327593

Offset

1,2

Comments

Diagonal of A300966.

Links

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

Example

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

Crossrefs

Cf. A300966.

Sequence in context: A013923 A053466 A005031 * A224440 A054939 A081782

Adjacent sequences: A300957 A300958 A300959 * A300961 A300962 A300963

Keyword

nonn

Author

R. H. Hardin, Mar 17 2018

Status

approved