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A304340 Number of nXn 0..1 arrays with every element unequal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero. 0
1, 4, 27, 290, 6373, 135445, 4921043, 343449680, 30008468246, 4458350461574 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A304347.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304347.

Sequence in context: A179494 A295255 A203157 * A119820 A159599 A221411

Adjacent sequences:  A304337 A304338 A304339 * A304341 A304342 A304343

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 11 2018

STATUS

approved

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Last modified March 23 09:20 EDT 2019. Contains 321424 sequences. (Running on oeis4.)