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A206221 Number of (n+1)X7 0..2 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing 0
139390, 53835891, 9098547899, 2537225006229, 656654900321262, 162241662044855141, 33632275642926148580, 5657294413089823562871 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A206223

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A145207 A236745 A205213 * A028518 A206748 A018234

Adjacent sequences:  A206218 A206219 A206220 * A206222 A206223 A206224

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 04 2012

STATUS

approved

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Last modified May 24 21:58 EDT 2022. Contains 354043 sequences. (Running on oeis4.)