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A298488 Number of n X n 0..1 arrays with every element equal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero. 0
1, 7, 20, 41, 178, 388, 628, 1708, 2860, 4002, 9979, 17394, 15401, 63332, 135334, 82102, 702695, 2582167, 1191816, 17532272, 141444005, 38062610 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298494.

LINKS

Table of n, a(n) for n=1..22.

EXAMPLE

Some solutions for n=9

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

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

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

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

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

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

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

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

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

CROSSREFS

Cf. A298494.

Sequence in context: A100752 A162024 A143058 * A175428 A232599 A011934

Adjacent sequences:  A298485 A298486 A298487 * A298489 A298490 A298491

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 20 2018

STATUS

approved

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Last modified October 23 11:52 EDT 2021. Contains 348212 sequences. (Running on oeis4.)