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A305277 Number of nXn 0..1 arrays with every element unequal to 0, 2, 3, 4 or 8 king-move adjacent elements, with upper left element zero. 0
1, 4, 11, 166, 1185, 26577, 342596, 9804507, 220905716, 9470663034, 400580293516 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A305281.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A305281.

Sequence in context: A119571 A089920 A303881 * A118197 A092658 A304888

Adjacent sequences:  A305274 A305275 A305276 * A305278 A305279 A305280

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 29 2018

STATUS

approved

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Last modified February 24 22:57 EST 2020. Contains 332216 sequences. (Running on oeis4.)