A298088 Number of n X n 0..1 arrays with every element equal to 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.

0, 3, 15, 30, 45, 171, 229, 417, 822, 1359, 1993, 5049, 3669, 7878, 33158, 16734, 37752, 734240, 160344, 389218, 50665319, 1735920, 6661033

Offset

1,2

Comments

Diagonal of A298093.

Links

Table of n, a(n) for n=1..23.

Example

Some solutions for n=7
..0..0..1..0..1..0..1. .0..0..1..0..0..1..1. .0..1..1..0..0..0..0
..1..1..0..1..0..1..0. .1..0..1..1..1..0..0. .1..0..0..1..1..1..1
..1..0..1..0..1..0..1. .1..1..1..0..0..0..1. .0..1..0..0..0..0..0
..1..1..1..0..0..0..1. .0..0..0..1..1..0..1. .0..1..0..1..1..1..1
..1..1..1..0..0..0..1. .1..1..1..1..0..0..1. .0..1..0..0..0..0..0
..1..0..1..0..1..0..1. .0..0..0..1..0..0..1. .1..0..0..1..1..1..1
..0..0..1..1..1..0..0. .1..1..1..0..1..1..0. .0..1..1..0..0..0..0

Crossrefs

Cf. A298093.

Sequence in context: A020493 A087183 A297851 * A290325 A271326 A106354

Adjacent sequences: A298085 A298086 A298087 * A298089 A298090 A298091

Keyword

nonn

Author

R. H. Hardin, Jan 12 2018

Status

approved