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A298288 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero. 0
1, 7, 20, 46, 308, 990, 4679, 26963, 153319, 1074940, 8523830, 71415327 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298294.

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A298294.

Sequence in context: A011934 A159222 A100206 * A299384 A007044 A047862

Adjacent sequences:  A298285 A298286 A298287 * A298289 A298290 A298291

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 16 2018

STATUS

approved

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Last modified January 23 14:34 EST 2022. Contains 350512 sequences. (Running on oeis4.)