A318041 - OEIS

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A318041

Number of nX4 0..1 arrays with every element unequal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1

1, 3, 21, 140, 905, 6179, 42793, 297043, 2056698, 14234986, 98543469, 682235511, 4723208829, 32699080489, 226377712742, 1567228238886, 10850029939485, 75115505261838, 520029800880263, 3600202027360686, 24924446019234303

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Column 4 of A318045.

LINKS

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

R. H. Hardin, Empirical recurrence of order 72

FORMULA

Empirical recurrence of order 72 (see link above)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Sequence in context: A137969 A303349 A337467 * A054419 A228115 A377096

Adjacent sequences: A318038 A318039 A318040 * A318042 A318043 A318044

KEYWORD

nonn

AUTHOR

R. H. Hardin, Aug 13 2018

STATUS

approved