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A299873 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5, 7 or 8 king-move adjacent elements, with upper left element zero. 0
1, 7, 20, 125, 3068, 54005, 2714797, 213883244, 29310012663 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A299879.

LINKS

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

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A299879.

Sequence in context: A299346 A009370 A299091 * A009372 A051102 A299009

Adjacent sequences:  A299870 A299871 A299872 * A299874 A299875 A299876

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 21 2018

STATUS

approved

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Last modified August 10 11:03 EDT 2022. Contains 356039 sequences. (Running on oeis4.)