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A306130 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 0
1, 4, 13, 498, 31843, 3176303, 1284005626, 1028875496355, 1754773074616835 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A306136.

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A306136.

Sequence in context: A219571 A304545 A316372 * A317267 A219366 A270638

Adjacent sequences:  A306127 A306128 A306129 * A306131 A306132 A306133

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 22 2018

STATUS

approved

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Last modified July 1 03:30 EDT 2022. Contains 354947 sequences. (Running on oeis4.)