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A206216 Number of (n+1)X(n+1) 0..2 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing 0
81, 7313, 1782191, 1827047303, 7626209039519, 162241662044855141 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206223

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A223553 A185770 A222441 * A205056 A186132 A206504

Adjacent sequences:  A206213 A206214 A206215 * A206217 A206218 A206219

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 04 2012

STATUS

approved

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Last modified November 29 21:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)