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A187454 Number of (n+1)X(n+1) 0..2 arrays with the array of 2X2 subblock determinants symmetric 0
81, 5175, 1293651, 983320335, 2806943351103, 25357269654789183, 816485466267634598145 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A187457

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for 4X4

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

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

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

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

CROSSREFS

Sequence in context: A205285 A222166 A219728 * A206406 A238172 A260858

Adjacent sequences:  A187451 A187452 A187453 * A187455 A187456 A187457

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2011

STATUS

approved

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Last modified October 18 08:58 EDT 2021. Contains 348067 sequences. (Running on oeis4.)