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A191295 Number of n X n symmetric binary matrices with each 1 adjacent to exactly 2 knight-move neighboring 1s 0
1, 1, 2, 17, 61, 241, 1077, 10002, 130992, 2166639, 41299118, 1000354787, 34454184106 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..13.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A071402 A228641 A226417 * A002430 A160469 A176581

Adjacent sequences:  A191292 A191293 A191294 * A191296 A191297 A191298

KEYWORD

nonn

AUTHOR

R. H. Hardin May 29 2011

STATUS

approved

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Last modified October 22 01:38 EDT 2018. Contains 316431 sequences. (Running on oeis4.)