A305011 Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

2, 10, 31, 42, 255, 862, 2200, 8807, 33055, 106158, 385363, 1430563, 4984613, 17903390, 65557446, 234669342, 845691032, 3078003683, 11115610686, 40193431243, 145975752428, 528747707176, 1915566040755, 6952384042215

Offset

1,1

Comments

Column 4 of A305015.

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..0..0. .0..0..0..1. .0..0..0..1. .0..1..0..1. .0..0..1..1
..0..0..0..1. .0..1..1..1. .1..0..0..1. .0..0..1..1. .0..1..0..1
..0..0..0..0. .0..0..0..1. .0..0..0..0. .1..0..1..0. .0..1..1..1
..1..0..0..1. .0..0..0..1. .1..0..0..1. .0..1..0..1. .0..0..1..1
..0..0..0..0. .0..1..1..1. .0..0..0..1. .0..0..1..1. .0..1..0..1

Crossrefs

Cf. A305015.

Sequence in context: A281069 A156492 A297467 * A090809 A051747 A193008

Adjacent sequences: A305008 A305009 A305010 * A305012 A305013 A305014

Keyword

nonn

Author

R. H. Hardin, May 23 2018

Status

approved