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A318216
Number of nXn 0..1 arrays with every element unequal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
0
0, 1, 4, 174, 24576, 12458503, 21578384304, 127593300875084, 2578465118138197116, 178097203297601659441467, 42043114501504823608330154694
OFFSET
1,3
COMMENTS
Diagonal of A318222.
EXAMPLE
Some solutions for n=5
..0..1..0..0..1. .0..1..1..0..1. .0..1..0..1..0. .0..1..0..0..1
..1..1..0..1..0. .1..0..1..0..1. .1..0..0..1..0. .1..1..0..1..0
..0..0..1..1..0. .0..0..1..0..0. .0..0..0..1..0. .0..1..1..0..1
..1..0..1..0..1. .1..1..0..1..0. .1..1..0..0..1. .0..0..0..1..0
..1..0..0..1..0. .0..0..1..0..1. .0..0..1..1..0. .1..1..1..0..1
CROSSREFS
Cf. A318222.
Sequence in context: A145245 A081783 A222921 * A006433 A251695 A343610
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 21 2018
STATUS
approved