A297768 Number of 7Xn 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2, 3 or 4 neighboring 1s.

1, 69, 28565, 720785, 18733087, 1504842706, 108229776807, 5471123716394, 286817881089193, 17003133505644511, 992034690844277806, 55560988268455263857, 3131312608795918940918, 178941939002152696425045

Offset

1,2

Comments

Row 7 of A297762.

Links

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

Example

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

Crossrefs

Cf. A297762.

Sequence in context: A297807 A251002 A194612 * A268847 A211212 A175049

Adjacent sequences: A297765 A297766 A297767 * A297769 A297770 A297771

Keyword

nonn

Author

R. H. Hardin, Jan 05 2018

Status

approved