A191569 - OEIS

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A191569

Number of n X n symmetric binary matrices with each 1 adjacent to no more than 1 knight-move neighboring 1

2, 8, 34, 183, 2129, 33462, 770926, 26032324, 1354203171, 103491528931, 11756048816408, 2008909410467497, 510889483445894680, 194267241325094317359, 109588026470607538438518

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=6

..1..0..0..0..0..0....1..0..1..1..0..0....1..0..0..0..0..0....0..1..0..0..1..1

..0..0..0..0..0..1....0..0..0..1..0..0....0..1..0..0..1..1....1..1..0..0..1..0

..0..0..1..0..0..0....1..0..0..0..0..0....0..0..0..0..1..1....0..0..0..0..1..1

..0..0..0..0..0..0....1..1..0..0..1..0....0..0..0..0..0..0....0..0..0..0..0..0

..0..0..0..0..0..0....0..0..0..1..1..1....0..1..1..0..0..0....1..1..1..0..0..0

..0..1..0..0..0..1....0..0..0..0..1..0....0..1..1..0..0..1....1..0..1..0..0..1

CROSSREFS

Sequence in context: A061370 A126328 A268558 * A229812 A346413 A013026

Adjacent sequences: A191566 A191567 A191568 * A191570 A191571 A191572

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 06 2011

STATUS

approved