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A299009 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero. 0
1, 7, 20, 174, 6908, 379236, 59666756, 22388413097, 20692923925827 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A299015.

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

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

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

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

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

CROSSREFS

Cf. A299015.

Sequence in context: A299873 A009372 A051102 * A299800 A299676 A300308

Adjacent sequences:  A299006 A299007 A299008 * A299010 A299011 A299012

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2018

STATUS

approved

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Last modified October 5 23:01 EDT 2022. Contains 357261 sequences. (Running on oeis4.)