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A298576 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 5 or 7 king-move adjacent elements, with upper left element zero. 0
0, 3, 15, 78, 765, 16521, 708805, 40964223, 4776371282, 1079598223972 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298582.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A298582.

Sequence in context: A104530 A297952 A298771 * A299568 A031884 A337284

Adjacent sequences:  A298573 A298574 A298575 * A298577 A298578 A298579

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 22 2018

STATUS

approved

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Last modified October 3 02:59 EDT 2022. Contains 357230 sequences. (Running on oeis4.)