A297550 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 or 3 neighboring 1s.

1, 69, 8057, 67215, 754342, 45293985, 1610981344, 33425081735, 874581570077, 29281129310008, 859429362196818, 23114288469712129, 662232886527397803, 19622752789142693265, 564182183135035001141, 16033004070256687706334

Offset

1,2

Comments

Row 7 of A297544.

Links

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

Example

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

Crossrefs

Cf. A297544.

Sequence in context: A363927 A364024 A264171 * A049000 A234824 A232719

Adjacent sequences: A297547 A297548 A297549 * A297551 A297552 A297553

Keyword

nonn

Author

R. H. Hardin, Dec 31 2017

Status

approved