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A205227 Number of (n+1)X(n+1) 0..2 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing, and all 2X2 permanents nonzero 0
56, 2773, 640652, 586841773, 3156944585806 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205235

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=4

..2..0..2..0..2....0..2..1..0..1....2..1..0..2..1....1..1..2..1..1

..1..1..0..1..0....1..2..0..2..1....2..0..2..0..2....2..2..0..2..2

..1..1..2..2..2....1..1..2..2..2....1..1..0..2..0....2..0..2..0..2

..0..2..2..1..2....2..2..0..2..2....0..2..2..0..2....2..2..2..2..2

..1..1..2..2..2....0..2..2..2..2....1..2..0..1..2....2..0..2..2..2

CROSSREFS

Sequence in context: A198948 A003696 A199709 * A328352 A224176 A223868

Adjacent sequences:  A205224 A205225 A205226 * A205228 A205229 A205230

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 24 2012

STATUS

approved

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Last modified September 21 13:58 EDT 2021. Contains 347598 sequences. (Running on oeis4.)