A297437 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1s.

1, 13, 320, 1085, 5108, 50127, 431723, 2741816, 19713343, 158831909, 1226649472, 9140274733, 69805274732, 540678554646, 4154873500103, 31813469310773, 244579087519367, 1883206579435015, 14482216168483555, 111339711139069346

Offset

1,2

Comments

Row 7 of A297431.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

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

Crossrefs

Cf. A297431.

Sequence in context: A052114 A305143 A132485 * A166743 A212733 A183803

Adjacent sequences: A297434 A297435 A297436 * A297438 A297439 A297440

Keyword

nonn

Author

R. H. Hardin, Dec 30 2017

Status

approved