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A183762 Number of 2 X 2 nonsingular 0..n matrices with rows and columns in increasing order. 1
2, 16, 61, 163, 359, 687, 1206, 1966, 3040, 4498, 6435, 8917, 12077, 15993, 20788, 26588, 33542, 41744, 51397, 62595, 75543, 90407, 107382, 126582, 148292, 172670, 199931, 230277, 264005, 301225, 342332, 387452, 436902, 490948, 549841, 613831 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

EXAMPLE

Some solutions for n=2:

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

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

CROSSREFS

Sequence in context: A208495 A207583 A152665 * A061608 A212899 A127276

Adjacent sequences:  A183759 A183760 A183761 * A183763 A183764 A183765

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2011

STATUS

approved

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Last modified September 16 13:36 EDT 2021. Contains 347472 sequences. (Running on oeis4.)