A304693 Number of nX4 0..1 arrays with every element unequal to 1, 2, 3, 5 or 6 king-move adjacent elements, with upper left element zero.

2, 45, 178, 918, 4910, 24408, 124399, 641663, 3271834, 16747810, 85795064, 438971334, 2247194765, 11504929439, 58893248470, 301494626010, 1543466274885, 7901476939284, 40450502258451, 207080879283742, 1060121076327341

Offset

1,1

Comments

Column 4 of A304697.

Links

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

R. H. Hardin, Empirical recurrence of order 69

Formula

Empirical recurrence of order 69 (see link above)

Example

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

Crossrefs

Cf. A304697.

Sequence in context: A019579 A302220 A302666 * A200158 A316444 A316126

Adjacent sequences: A304690 A304691 A304692 * A304694 A304695 A304696

Keyword

nonn

Author

R. H. Hardin, May 17 2018

Status

approved