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A191572
Number of n X n symmetric binary matrices with each 1 adjacent to no more than 4 knight-move neighboring 1s
0
2, 8, 64, 1024, 24975, 1117404, 98925520, 16397607520, 4973951282668, 2743737089908402, 2786025507390606149
OFFSET
1,1
EXAMPLE
Some solutions for n=6
..0..1..0..0..1..0....0..1..0..1..0..0....0..0..0..1..1..0....0..1..1..0..1..0
..1..0..0..1..1..1....1..0..0..0..0..0....0..0..0..0..1..1....1..0..0..1..1..0
..0..0..1..0..0..1....0..0..0..0..0..1....0..0..0..0..0..0....1..0..0..0..1..1
..0..1..0..0..0..1....1..0..0..0..0..0....1..0..0..0..0..0....0..1..0..1..0..1
..1..1..0..0..0..0....0..0..0..0..0..1....1..1..0..0..1..1....1..1..1..0..0..0
..0..1..1..1..0..0....0..0..1..0..1..1....0..1..0..0..1..1....0..0..1..1..0..1
CROSSREFS
Sequence in context: A153534 A153563 A178169 * A191573 A136283 A139680
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 06 2011
STATUS
approved