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A304413 Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 4 or 5 king-move adjacent elements, with upper left element zero. 0
1, 4, 23, 835, 98568, 32181958, 29251894460, 71613287309909, 478060061219665260 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304419.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304419.

Sequence in context: A266919 A219464 A107765 * A316240 A305948 A317211

Adjacent sequences:  A304410 A304411 A304412 * A304414 A304415 A304416

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 12 2018

STATUS

approved

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Last modified May 16 11:02 EDT 2022. Contains 353700 sequences. (Running on oeis4.)