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A187453 Number of (n+1)X(n+1) 0..1 arrays with the array of 2X2 subblock determinants symmetric 0
16, 264, 10776, 1011136, 229028648, 121525356464, 153323988561520, 455805504397977992, 3209063463825423259232, 53344074954377463462263136, 2097212449015058409197692938608 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A187457

LINKS

Table of n, a(n) for n=1..11.

EXAMPLE

Some solutions for 4X4

..0..0..1..1....1..0..1..0....0..1..1..0....1..0..1..1....1..1..1..1

..1..0..1..1....0..0..1..1....0..1..0..0....1..0..0..1....0..0..0..0

..0..0..1..0....1..0..1..0....1..0..1..0....1..0..1..0....0..0..0..1

..1..1..0..1....0..1..0..0....0..0..1..0....0..1..0..0....0..0..1..0

CROSSREFS

Sequence in context: A068770 A113359 A236516 * A333903 A218062 A220757

Adjacent sequences:  A187450 A187451 A187452 * A187454 A187455 A187456

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2011

STATUS

approved

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Last modified December 7 22:50 EST 2021. Contains 349590 sequences. (Running on oeis4.)