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A304842 Number of n X n 0..1 arrays with every element unequal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero. 0
1, 4, 25, 132, 3009, 67025, 1500288, 105482136, 11448808957, 1335761507398, 322003120783835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304848.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304848.

Sequence in context: A263440 A240631 A123660 * A156701 A273120 A220381

Adjacent sequences:  A304839 A304840 A304841 * A304843 A304844 A304845

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 19 2018

STATUS

approved

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Last modified October 27 09:55 EDT 2021. Contains 348274 sequences. (Running on oeis4.)