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A301658

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

5, 6, 9, 13, 24, 45, 89, 182, 373, 773, 1604, 3333, 6933, 14422, 30009, 62445, 129944, 270413, 562729, 1171046, 2436965, 5071365, 10553604, 21962245, 45703845, 95110566, 197926889, 411889613, 857150104, 1783745645, 3712008569, 7724760342

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

OFFSET

1,1

COMMENTS

Column 4 of A301662.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +a(n-2) -a(n-3) -2*a(n-4) +a(n-5)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301662.

Sequence in context: A047438 A341301 A218735 * A286338 A344231 A117951

Adjacent sequences: A301655 A301656 A301657 * A301659 A301660 A301661

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 25 2018

STATUS

approved

URL: https://oeis.org/A301658

⇱ A301658 - OEIS