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A301887 Number of 4Xn 0..1 arrays with every element equal to 0, 1 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
8, 34, 95, 203, 510, 1754, 5463, 16452, 49611, 153498, 478314, 1488796, 4635051, 14448493, 45103531, 140813098, 439606342, 1372574192, 4286144428, 13385273545, 41801527070, 130545539541, 407696977117, 1273260715371, 3976480385362 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A301884.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A301884.

Sequence in context: A298174 A249743 A298140 * A208639 A240785 A066804

Adjacent sequences:  A301884 A301885 A301886 * A301888 A301889 A301890

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 28 2018

STATUS

approved

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Last modified October 23 22:31 EDT 2021. Contains 348217 sequences. (Running on oeis4.)