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A184893 Number of 3X3 1..n+1 arrays with positive determinant 1
132, 7854, 116520, 916860, 4820439, 19624035, 65713455, 190759077, 493962822, 1168477251, 2559841278, 5270707320, 10278584778, 19140242421, 34233601737, 59117179833, 98911520802, 160982370882, 255478326648, 396430119123 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..39

EXAMPLE

Some positive determinant 3X3 1..2 matrices

..2..2..2....2..2..1....2..2..1....2..2..1....1..1..2....2..1..2....2..2..2

..2..1..1....2..1..2....1..2..1....1..2..1....2..1..1....2..1..1....2..2..1

..2..2..1....2..1..1....2..1..2....2..2..2....1..1..1....1..2..1....1..2..2

CROSSREFS

Sequence in context: A335857 A270411 A258493 * A035818 A258394 A215546

Adjacent sequences:  A184890 A184891 A184892 * A184894 A184895 A184896

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 02 2011

STATUS

approved

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Last modified May 18 07:26 EDT 2021. Contains 343995 sequences. (Running on oeis4.)