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A191573 Number of n X n symmetric binary matrices with each 1 adjacent to no more than 5 knight-move neighboring 1s 0
2, 8, 64, 1024, 27243, 1382864, 140750620, 28217901400, 10950671730896, 8078548919508508, 11458732300832773022 (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..1..0..1..0..1....0..1..0..0..1..0....0..0..0..0..1..1....0..1..0..1..1..0

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

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

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

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

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

CROSSREFS

Sequence in context: A153563 A178169 A191572 * A136283 A139680 A153544

Adjacent sequences: A191570 A191571 A191572 * A191574 A191575 A191576

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 06 2011

STATUS

approved

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Last modified December 3 16:31 EST 2022. Contains 358534 sequences. (Running on oeis4.)