A320405 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

8, 35, 156, 786, 3761, 18725, 92578, 463045, 2308299, 11536977, 57665448, 288255915, 1441171251, 7205071761, 36023566370, 180108084412, 900499990791, 4502306264686, 22510579308742, 112548275061883, 562718206201266

Offset

1,1

Comments

Column 4 of A320409.

Links

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

R. H. Hardin, Empirical recurrence of order 83

Formula

Empirical recurrence of order 83 (see link above)

Example

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

Crossrefs

Cf. A320409.

Sequence in context: A114569 A189599 A302078 * A279379 A098999 A263520

Adjacent sequences: A320402 A320403 A320404 * A320406 A320407 A320408

Keyword

nonn

Author

R. H. Hardin, Oct 12 2018

Status

approved