A297687 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 0, 1 or 4 neighboring 1s.

128, 2570, 94891, 1955750, 59210634, 1487819051, 41030621948, 1066508741933, 28748828127508, 759564088991329, 20288126990340123, 538493726660721622, 14345913847238205189, 381379710626740656598, 10150876741291095683850

Offset

1,1

Comments

Row 7 of A297682.

Links

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

Example

Some solutions for n=3
..1..0..0. .1..0..1. .0..1..1. .1..0..0. .1..0..0. .1..0..0. .1..0..1
..0..1..0. .1..0..1. .0..0..0. .1..0..0. .0..0..1. .1..0..0. .1..0..0
..0..0..0. .0..0..0. .0..0..1. .1..1..1. .1..1..1. .0..0..0. .0..0..0
..0..0..1. .0..0..1. .0..0..1. .0..0..1. .0..0..1. .1..0..0. .0..0..0
..1..0..0. .0..0..0. .0..1..1. .0..0..0. .1..0..0. .1..0..0. .0..0..0
..1..0..1. .0..0..0. .1..0..1. .1..0..1. .0..0..1. .0..0..0. .0..0..1
..0..0..0. .1..0..0. .1..0..0. .1..0..1. .0..0..1. .0..0..1. .0..0..0

Crossrefs

Cf. A297682.

Sequence in context: A231306 A236209 A283548 * A221662 A250282 A019564

Adjacent sequences: A297684 A297685 A297686 * A297688 A297689 A297690

Keyword

nonn

Author

R. H. Hardin, Jan 03 2018

Status

approved