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A298655 Number of nXn 0..1 arrays with every element equal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 0
0, 3, 15, 40, 177, 1116, 7964, 89543, 1367704, 32451809, 1028816587 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298660.

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A298660.

Sequence in context: A014309 A298049 A298884 * A299608 A249835 A295938

Adjacent sequences:  A298652 A298653 A298654 * A298656 A298657 A298658

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 24 2018

STATUS

approved

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Last modified January 20 10:58 EST 2020. Contains 331081 sequences. (Running on oeis4.)