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A204706 Number of (n+1)X(n+1) 0..1 arrays with the permanents of all 2X2 subblocks equal and nonzero 1
7, 33, 257, 3473, 73345, 2542369, 140090241, 12503757969, 1787244586881, 411927241028353, 152442345546739969, 90819596095626887105, 86960426240537811217921, 133963874202574308172821153 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204713

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..19

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A292427 A333565 A215125 * A197995 A207150 A197565

Adjacent sequences:  A204703 A204704 A204705 * A204707 A204708 A204709

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 18 2012

STATUS

approved

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Last modified September 27 20:35 EDT 2020. Contains 337388 sequences. (Running on oeis4.)