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A298884 Number of n X n 0..1 arrays with every element equal to 1, 2, 4, 6 or 8 king-move adjacent elements, with upper left element zero. 0
0, 3, 15, 40, 123, 516, 1818, 7768, 41048, 242083, 1483959, 10171555 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298888.

LINKS

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

EXAMPLE

Some solutions for n=7

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

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

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

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

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

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

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

CROSSREFS

Cf. A298888.

Sequence in context: A297621 A014309 A298049 * A298655 A299608 A249835

Adjacent sequences:  A298881 A298882 A298883 * A298885 A298886 A298887

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 28 2018

STATUS

approved

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Last modified November 29 01:40 EST 2021. Contains 349416 sequences. (Running on oeis4.)