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A187455 Number of (n+1)X(n+1) 0..3 arrays with the array of 2X2 subblock determinants symmetric 0
256, 38464, 34166592, 99952737952, 1694940245504992, 98104220374911288448 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A187457

LINKS

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

EXAMPLE

Some solutions for 5X5

..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0

..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0

..0..0..0..2..0....0..0..2..1..2....0..3..1..3..1....0..3..1..0..3

..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0

..0..0..0..1..0....0..0..1..1..1....0..0..3..1..2....0..0..3..2..1

CROSSREFS

Sequence in context: A207791 A018798 A017320 * A181251 A132637 A114850

Adjacent sequences:  A187452 A187453 A187454 * A187456 A187457 A187458

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2011

STATUS

approved

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Last modified November 28 03:29 EST 2021. Contains 349400 sequences. (Running on oeis4.)