A298383 Number of n X n 0..1 arrays with every element equal to 1, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

0, 4, 56, 996, 49850, 3935913, 509195874, 190487814086, 121220201152514

Offset

1,2

Comments

Diagonal of A298389.

Links

Table of n, a(n) for n=1..9.

Example

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

Crossrefs

Cf. A298389.

Sequence in context: A297944 A298555 A240298 * A326289 A369534 A078533

Adjacent sequences: A298380 A298381 A298382 * A298384 A298385 A298386

Keyword

nonn

Author

R. H. Hardin, Jan 18 2018

Status

approved