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A300026 Number of n X n 0..1 arrays with every element equal to 0, 1, 3, 4, 6, 7 or 8 king-move adjacent elements, with upper left element zero. 0
1, 4, 3, 80, 1637, 18775, 1841903, 326461365, 50773963070, 27507422939178 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A300030.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A300030.

Sequence in context: A299389 A220556 A299188 * A266255 A325871 A079324

Adjacent sequences:  A300023 A300024 A300025 * A300027 A300028 A300029

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 23 2018

STATUS

approved

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Last modified July 2 07:13 EDT 2020. Contains 335398 sequences. (Running on oeis4.)