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A301540 Number of nX7 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero. 1
21, 86, 374, 1841, 9037, 47791, 255406, 1432328, 8145489, 46701775, 269741883, 1568279203, 9153838956, 53577605791, 314145731065, 1844204380914, 10835966335712, 63710021424647, 374740321237045, 2204822119962792 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A301541.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..156

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301541.

Sequence in context: A220613 A045016 A171129 * A240518 A219850 A158540

Adjacent sequences:  A301537 A301538 A301539 * A301541 A301542 A301543

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 23 2018

STATUS

approved

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Last modified April 10 22:21 EDT 2021. Contains 342856 sequences. (Running on oeis4.)