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A052557
A simple regular expression in a labeled universe.
+0
1
1, 0, 0, 6, 24, 120, 1440, 15120, 161280, 2177280, 32659200, 518918400, 9101030400, 174356582400, 3574309939200, 78460462080000, 1841205510144000, 45883678224384000, 1210048630382592000
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
)
Last modified December 18 21:37 EST 2009. Contains 171024 sequences.
AT&T Labs Research
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