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A052687
A simple regular expression in a labeled universe.
+0
1
1, 2, 6, 18, 96, 480, 3600, 25200, 241920, 2177280, 25401600, 279417600, 3832012800, 49816166400, 784604620800, 11769069312000, 209227898880000, 3556874280960000, 70426110763008000, 1338096104497152000
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.
AT&T Labs Research
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