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A302064 Number of nX3 0..1 arrays with every element equal to 0, 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
4, 25, 148, 884, 5296, 31760, 190528, 1143104, 6858496, 41150720, 246903808, 1481421824, 8888528896, 53331169280, 319987007488, 1919922028544, 11519532138496, 69117192765440, 414703156461568, 2488218938507264 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A302069.

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -12*a(n-2) for n>3

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A302069.

Sequence in context: A079291 A173612 A072221 * A221849 A055846 A091634

Adjacent sequences:  A302061 A302062 A302063 * A302065 A302066 A302067

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 31 2018

STATUS

approved

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Last modified September 26 01:25 EDT 2020. Contains 337346 sequences. (Running on oeis4.)