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A298049 Number of nXn 0..1 arrays with every element equal to 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero. 0
0, 3, 15, 40, 121, 512, 1708, 7014, 35804, 201703, 1158266, 7391098, 54852360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298055.

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A298055.

Sequence in context: A183476 A297621 A014309 * A298884 A298655 A299608

Adjacent sequences:  A298046 A298047 A298048 * A298050 A298051 A298052

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 11 2018

STATUS

approved

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Last modified July 20 01:17 EDT 2019. Contains 325168 sequences. (Running on oeis4.)