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A298214 Number of nXn 0..1 arrays with every element equal to 0, 1, 2, 4 or 5 king-move adjacent elements, with upper left element zero. 0
1, 7, 20, 120, 2066, 25717, 1261845, 72407248, 7205019743, 1633990811314 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A298221.

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Cf. A298221.

Sequence in context: A299181 A299944 A265657 * A299346 A009370 A299091

Adjacent sequences:  A298211 A298212 A298213 * A298215 A298216 A298217

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 15 2018

STATUS

approved

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Last modified January 25 07:44 EST 2020. Contains 331241 sequences. (Running on oeis4.)