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A301793 Number of 4Xn 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
8, 34, 24, 32, 45, 66, 100, 155, 244, 388, 621, 998, 1608, 2595, 4192, 6776, 10957, 17722, 28668, 46379, 75036, 121404, 196429, 317822, 514240, 832051, 1346280, 2178320, 3524589, 5702898, 9227476, 14930363, 24157828, 39088180, 63245997 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A301790.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -a(n-3) for n>5

EXAMPLE

Some solutions for n=5

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

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

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

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

CROSSREFS

Cf. A301790.

Sequence in context: A299390 A299191 A300027 * A301966 A196143 A307091

Adjacent sequences:  A301790 A301791 A301792 * A301794 A301795 A301796

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 26 2018

STATUS

approved

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Last modified September 23 11:23 EDT 2020. Contains 337310 sequences. (Running on oeis4.)