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A227746 Number of n X n 0,1 arrays indicating 2X2 subblocks of some larger (n+1)X(n+1) binary array having determinant equal to one 0
2, 13, 210, 10092, 1378923, 536234494, 593219255593, 1866485946679255, 16707964949615383863, 425495289603079437453771, 30826893520750966059187346452 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A227751

LINKS

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

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Sequence in context: A053598 A193550 A102585 * A078702 A259795 A069569

Adjacent sequences:  A227743 A227744 A227745 * A227747 A227748 A227749

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 25 2013

STATUS

approved

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Last modified January 20 16:46 EST 2019. Contains 319335 sequences. (Running on oeis4.)