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A301996 Number of nX5 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
3, 18, 84, 468, 2856, 17800, 110036, 674984, 4130664, 25284068, 154853080, 948637896, 5811528980, 35601208264, 218086661704, 1335953081860, 8183781374680, 50132301702344, 307101237458324, 1881245567361512 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A301999.

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) -141*a(n-2) +661*a(n-3) -2058*a(n-4) +4393*a(n-5) -6412*a(n-6) +6060*a(n-7) -3280*a(n-8) +640*a(n-9) +192*a(n-10) -64*a(n-11) for n>12

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301999.

Sequence in context: A122069 A103897 A119424 * A218924 A037295 A290331

Adjacent sequences:  A301993 A301994 A301995 * A301997 A301998 A301999

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 30 2018

STATUS

approved

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Last modified July 30 11:46 EDT 2021. Contains 346359 sequences. (Running on oeis4.)