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A301609 Number of nXn 0..1 arrays with every element equal to 1, 2 or 3 horizontally or vertically adjacent elements, with upper left element zero. 0
0, 3, 62, 3816, 758338, 488491106, 1019565752074, 6897694015722898, 151249886315100454600, 10749578188598491367494716 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A301615.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=5

..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0

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

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

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

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

CROSSREFS

Cf. A301615.

Sequence in context: A275746 A177496 A104403 * A144422 A135444 A182468

Adjacent sequences:  A301606 A301607 A301608 * A301610 A301611 A301612

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 24 2018

STATUS

approved

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Last modified July 22 10:03 EDT 2019. Contains 325219 sequences. (Running on oeis4.)