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A191575 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 7 knight-move neighboring 1s 1
2, 8, 64, 1024, 31744, 1966328, 243334360, 60208129728, 29758502758208, 29361656860572672, 57846064835261224704, 227511075000523635983456, 1786387499611617848051648112, 28002804481527546759736622292320 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..16

EXAMPLE

Some solutions for n=6

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

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

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

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

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

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

CROSSREFS

Sequence in context: A153544 A153572 A191574 * A153545 A153573 A153546

Adjacent sequences:  A191572 A191573 A191574 * A191576 A191577 A191578

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 06 2011

STATUS

approved

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Last modified October 4 17:49 EDT 2022. Contains 357239 sequences. (Running on oeis4.)