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A303881
Number of n X n 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.
0
1, 4, 11, 166, 1150, 24985, 308271, 7577931, 148783767, 4946437814, 177760275047
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A303888.
LINKS
Table of n, a(n) for n=1..11.
EXAMPLE
Some solutions for n=5
..0..1..1..0..0. .0..1..0..1..1. .0..1..0..1..1. .0..1..0..0..1
..1..0..0..1..1. .0..1..1..0..0. .0..1..1..0..0. .0..1..1..1..0
..1..0..0..1..1. .0..1..1..0..0. .0..1..1..0..0. .0..1..1..1..1
..1..0..0..1..1. .1..1..1..0..0. .0..1..1..0..0. .0..1..1..1..0
..0..1..0..1..1. .0..1..0..1..1. .0..1..1..0..0. .0..1..0..0..1
CROSSREFS
Cf. A303888.
Sequence in context: A006248 A119571 A089920 * A305277 A118197 A092658
Adjacent sequences: A303878 A303879 A303880 * A303882 A303883 A303884
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 02 2018
STATUS
approved

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Last modified October 4 19:29 EDT 2024. Contains 376520 sequences.
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