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A301837 Number of nX4 0..1 arrays with every element equal to 0, 1 or 2 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
8, 81, 678, 5748, 48802, 414385, 3518619, 29877293, 253694309, 2154171994, 18291531681, 155317282580, 1318832060857, 11198483378779, 95088702916552, 807418390272882, 6855961191710593, 58215423910060190, 494319539779559696 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A301841.

LINKS

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

FORMULA

Empirical: a(n) = 13*a(n-1) -46*a(n-2) +72*a(n-3) -57*a(n-4) +16*a(n-5) for n>6

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301841.

Sequence in context: A274752 A240632 A007792 * A264185 A302065 A098308

Adjacent sequences:  A301834 A301835 A301836 * A301838 A301839 A301840

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 27 2018

STATUS

approved

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Last modified August 10 13:12 EDT 2022. Contains 356039 sequences. (Running on oeis4.)