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A007868
Number of inverse pairs of elements in symmetric group S_n, or pairs of total orders on n nodes (average of
A000085
and
A000142
).
+0
1
1, 1, 2, 5, 17, 73, 398, 2636, 20542, 182750, 1819148, 19976248, 239570876, 3113794652, 43590340840, 653842358768, 10461418047368, 177843819947656
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
AT&T Labs Research
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