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A304946
Number of n X n 0..1 arrays with every element unequal to 0, 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.
0
1, 4, 13, 26, 189, 1916, 18950, 401301, 12197817, 468373258
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A304952.
LINKS
Table of n, a(n) for n=1..10.
EXAMPLE
Some solutions for n=5
..0..1..0..1..1. .0..1..1..1..0. .0..1..0..1..0. .0..0..0..0..0
..1..0..1..0..0. .0..1..1..1..0. .1..1..1..1..0. .1..1..1..1..1
..1..0..1..0..1. .1..0..1..0..1. .0..1..1..0..0. .1..1..1..1..1
..0..1..0..1..1. .1..1..1..1..1. .1..1..0..1..1. .1..1..1..1..1
..1..0..0..0..0. .0..1..0..1..0. .0..0..0..1..0. .1..1..1..1..1
CROSSREFS
Cf. A304952.
Sequence in context: A206804 A304003 A305356 * A316616 A119652 A147875
Adjacent sequences: A304943 A304944 A304945 * A304947 A304948 A304949
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 22 2018
STATUS
approved

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Last modified November 9 05:11 EST 2024. Contains 377556 sequences.
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