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A183762 Number of 2 X 2 nonsingular 0..n matrices with rows and columns in increasing order. 1

%I

%S 2,16,61,163,359,687,1206,1966,3040,4498,6435,8917,12077,15993,20788,

%T 26588,33542,41744,51397,62595,75543,90407,107382,126582,148292,

%U 172670,199931,230277,264005,301225,342332,387452,436902,490948,549841,613831

%N Number of 2 X 2 nonsingular 0..n matrices with rows and columns in increasing order.

%H R. H. Hardin, <a href="/A183762/b183762.txt">Table of n, a(n) for n = 1..200</a>

%e Some solutions for n=2:

%e ..0..1....0..1....1..2....0..1....1..2....1..2....0..2....0..2....0..2....0..1

%e ..1..1....1..0....2..0....2..1....2..1....2..2....2..0....1..0....2..1....2..2

%K nonn

%O 1,1

%A _R. H. Hardin_, Jan 06 2011

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Last modified October 23 11:49 EDT 2021. Contains 348212 sequences. (Running on oeis4.)