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A300932 Number of nXn 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero. 0
1, 7, 52, 505, 6220, 97745, 2038646, 57179007, 2175995920, 112292412019 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A300937.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A300937.

Sequence in context: A249349 A300492 A179517 * A300875 A301485 A224501

Adjacent sequences:  A300929 A300930 A300931 * A300933 A300934 A300935

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 16 2018

STATUS

approved

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Last modified August 6 12:33 EDT 2020. Contains 336246 sequences. (Running on oeis4.)