A279980 Number of 4Xn 0..1 arrays with no element equal to a strict majority of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.

0, 31, 296, 1922, 10491, 50690, 226771, 963728, 3941732, 15655280, 60749739, 231325874, 867192006, 3208394065, 11737643962, 42526452550, 152777627539, 544782076812, 1929805835927, 6795769111934, 23804414728200, 82983605105905

Offset: 1

Author

R. H. Hardin, Dec 24 2016

Keywords

• nonn

Comments

Row 4 of A279977.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 68

Crossrefs

Cf. A279977.

Formula

Empirical recurrence of order 68 (see link above)