A304348 - OEIS

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A304348

Number of n X n 0..1 arrays with every element unequal to 0, 1, 3, 4 or 5 king-move adjacent elements, with upper left element zero.

1, 5, 13, 101, 1540, 36201, 9176798, 4663483164, 4502196415629

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

Diagonal of A304355.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304355.

Sequence in context: A123622 A337749 A117340 * A305912 A180827 A117437

Adjacent sequences: A304345 A304346 A304347 * A304349 A304350 A304351

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 11 2018

STATUS

approved