A300366 Number of n X n 0..1 arrays with every element equal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 0, 3, 32, 366, 12042, 729062, 70536528, 13229207915, 4795249162868

Offset

1,4

Comments

Diagonal of A300372.

Links

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

Example

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

Crossrefs

Cf. A300372.

Sequence in context: A091706 A091705 A137215 * A231591 A123336 A058479

Adjacent sequences: A300363 A300364 A300365 * A300367 A300368 A300369

Keyword

nonn

Author

R. H. Hardin, Mar 04 2018

Status

approved