A281768 Number of 4Xn 0..1 arrays with no element unequal to a strict majority of its horizontal, diagonal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

0, 20, 90, 560, 2808, 13968, 68362, 323280, 1529974, 7114300, 32915192, 151142772, 689726508, 3133687480, 14169310798, 63838844556, 286639424578, 1283124275056, 5728711606322, 25513799290264, 113382456085042, 502859346935932

Offset: 1

Author

R. H. Hardin, Jan 29 2017

Keywords

• nonn

Comments

Row 4 of A281765.

Examples

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

Links

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

Crossrefs

Cf. A281765.