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A191478 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 2 king-move neighboring 1s 1
2, 7, 28, 231, 3022, 63851, 2254102, 129926375, 12346854981, 1930513304865, 496013097993148, 209682700667891310, 145774046555290357339, 166670977286765976049136, 313418443881609705847873703 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
EXAMPLE
Some solutions for n=4
..1..1..0..1....0..0..0..1....0..0..1..0....0..1..1..1....1..1..0..1
..1..0..0..0....0..1..0..0....0..0..0..1....1..0..0..0....1..0..0..1
..0..0..0..1....0..0..1..0....1..0..0..0....1..0..0..1....0..0..1..0
..1..0..1..0....1..0..0..1....0..1..0..1....1..0..1..1....1..1..0..0
CROSSREFS
Sequence in context: A123026 A013011 A013181 * A321181 A122118 A337429
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 03 2011
STATUS
approved

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Last modified July 18 00:08 EDT 2024. Contains 374377 sequences. (Running on oeis4.)