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A305217 Number of n X n 0..1 arrays with every element unequal to 2, 3, 5, 6 or 7 king-move adjacent elements, with upper left element zero. 0
0, 3, 8, 49, 792, 32193, 1893682, 246793217, 75341044066, 37956401613275 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A305223.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305223.

Sequence in context: A304698 A306598 A019015 * A316797 A000862 A306042

Adjacent sequences:  A305214 A305215 A305216 * A305218 A305219 A305220

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 27 2018

STATUS

approved

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Last modified May 10 21:08 EDT 2021. Contains 343780 sequences. (Running on oeis4.)