A281033 Number of nX7 0..1 arrays with no element equal to more than three of its king-move neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

0, 1048, 31700, 146606, 722952, 3042556, 12164474, 46511454, 172759149, 628675456, 2254017339, 7988988368, 28056053572, 97767659494, 338498139062, 1165614974008, 3995250761421, 13639469138120, 46401641163562

Offset

1,2

Comments

Column 7 of A281034.

Links

R. H. Hardin, Table of n, a(n) for n = 1..148

Example

Some solutions for n=4
..0..0..0..1..1..0..1. .0..1..0..1..0..1..0. .0..0..1..0..1..0..1
..1..1..0..0..0..1..1. .1..0..1..0..1..0..1. .1..0..1..0..1..0..1
..0..1..1..1..1..1..0. .0..0..1..0..1..0..1. .1..0..1..0..0..0..1
..0..0..0..0..0..0..0. .1..0..1..0..0..1..0. .0..0..1..1..1..1..0

Crossrefs

Cf. A281034.

Sequence in context: A252307 A236273 A251375 * A337960 A331346 A164771

Adjacent sequences: A281030 A281031 A281032 * A281034 A281035 A281036

Keyword

nonn

Author

R. H. Hardin, Jan 13 2017

Status

approved