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A302678 Number of nX6 0..1 arrays with every element equal to 0, 1, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero. 1
13, 13, 40, 76, 187, 453, 1125, 2782, 6843, 16908, 41758, 103027, 254329, 627855, 1549720, 3825349, 9442726, 23308474, 57535003, 142020909, 350567119, 865346622, 2136039825, 5272643974, 13015100410, 32126739133, 79302295311, 195751392919 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A302680.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +2*a(n-2) +4*a(n-3) +a(n-4) -2*a(n-5) -a(n-6) for n>12

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302680.

Sequence in context: A210475 A304268 A214466 * A147249 A321654 A302513

Adjacent sequences:  A302675 A302676 A302677 * A302679 A302680 A302681

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 11 2018

STATUS

approved

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Last modified January 29 09:18 EST 2022. Contains 350672 sequences. (Running on oeis4.)