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A191571
Number of n X n symmetric binary matrices with each 1 adjacent to no more than 3 knight-move neighboring 1s
0
2, 8, 64, 775, 12956, 435303, 27256988, 2944205484, 528310229714, 165642950895264, 90217673507084286
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Table of n, a(n) for n=1..11.
EXAMPLE
Some solutions for n=6
..0..0..1..0..1..0....1..0..1..1..0..0....0..0..0..0..1..1....0..0..0..0..1..0
..0..0..0..1..0..1....0..0..0..0..1..0....0..0..0..0..1..0....0..0..1..0..0..0
..1..0..1..0..0..0....1..0..0..0..1..1....0..0..0..0..1..0....0..1..0..0..0..1
..0..1..0..0..1..0....1..0..0..0..0..0....0..0..0..0..1..0....0..0..0..0..0..0
..1..0..0..1..1..1....0..1..1..0..1..1....1..1..1..1..0..1....1..0..0..0..0..1
..0..1..0..0..1..0....0..0..1..0..1..0....1..0..0..0..1..1....0..0..1..0..1..1
CROSSREFS
Sequence in context: A136282 A092934 A224801 * A347012 A139679 A005640
Adjacent sequences: A191568 A191569 A191570 * A191572 A191573 A191574
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 06 2011
STATUS
approved

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Last modified November 7 15:02 EST 2024. Contains 377536 sequences.
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