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A304849 Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero. 0
1, 5, 9, 38, 148, 762, 6750, 97917, 1725334, 42688289, 1433354938 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304855.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304855.

Sequence in context: A098477 A243762 A303801 * A270622 A270673 A269702

Adjacent sequences:  A304846 A304847 A304848 * A304850 A304851 A304852

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 19 2018

STATUS

approved

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Last modified September 19 16:24 EDT 2021. Contains 347564 sequences. (Running on oeis4.)