A304700 Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

2, 10, 21, 48, 215, 798, 3055, 9810, 41744, 159183, 570536, 2308616, 8872579, 33367632, 131450744, 506761978, 1940496321, 7558901654, 29184688564, 112473463039, 436144732416, 1685260077151, 6509144124179, 25196323364937

Offset

1,1

Comments

Column 4 of A304704.

Links

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

R. H. Hardin, Empirical recurrence of order 67

Formula

Empirical recurrence of order 67 (see link above)

Example

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

Crossrefs

Cf. A304704.

Sequence in context: A294550 A296555 A231376 * A318548 A318210 A080881

Adjacent sequences: A304697 A304698 A304699 * A304701 A304702 A304703

Keyword

nonn

Author

R. H. Hardin, May 17 2018

Status

approved