A302639 Number of 6Xn 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

32, 42, 82, 248, 719, 2262, 6460, 19799, 59002, 179668, 535412, 1618765, 4863776, 14679083, 44118667, 132955659, 400197277, 1205668487, 3629343498, 10930567358, 32912798461, 99120195646, 298461584492, 898783501386, 2706487328339

Offset: 1

Author

R. H. Hardin, Apr 10 2018

Keywords

• nonn

Comments

Row 6 of A302635.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210
• R. H. Hardin, Empirical recurrence of order 81

Crossrefs

Cf. A302635.

Formula

Empirical recurrence of order 81 (see link above)