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A301789 Number of nX7 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
21, 35, 59, 100, 171, 294, 508, 881, 1532, 2670, 4661, 8147, 14254, 24957, 43721, 76625, 134335, 235566, 413157, 724732, 1271408, 2230625, 3913758, 6867218, 12049871, 21144385, 37103604, 65109365, 114255101, 200498599, 351843723 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 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-4) -a(n-6)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A301790.

Sequence in context: A290435 A138227 A246157 * A244166 A301963 A219919

Adjacent sequences:  A301786 A301787 A301788 * A301790 A301791 A301792

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 26 2018

STATUS

approved

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Last modified May 25 17:19 EDT 2020. Contains 334595 sequences. (Running on oeis4.)