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A211084
1/4 the number of n X n 0..3 symmetric matrices with every element equal to zero, two or three horizontal and vertical neighbors
0
1, 10, 228, 13227, 1888962, 662705112, 570731832303, 1205311139476404, 6235576486183465116, 78976030794422736761688
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
EXAMPLE
Some solutions for n=4
..0..3..1..3....2..1..2..1....0..1..0..3....0..2..3..0....0..2..3..1
..3..1..3..1....1..2..3..0....1..0..1..2....2..0..2..3....2..0..2..3
..1..3..1..0....2..3..2..1....0..1..3..1....3..2..3..1....3..2..1..0
..3..1..0..2....1..0..1..0....3..2..1..0....0..3..1..0....1..3..0..1
CROSSREFS
Sequence in context: A052789 A092254 A211079 * A302095 A276019 A004702
Adjacent sequences: A211081 A211082 A211083 * A211085 A211086 A211087
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 31 2012
STATUS
approved

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Last modified November 28 01:09 EST 2024. Contains 378181 sequences.
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