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A052574
A simple regular expression in a labeled universe.
+0
1
1, 1, 4, 30, 312, 4080, 64080, 1174320, 24595200, 579519360, 15172012800, 436929292800, 13726748851200, 467182235520000, 17123385600921600, 672444082582272000, 28167703419727872000, 1253648083943743488000
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 17 23:40 EST 2009. Contains 171025 sequences.
AT&T Labs Research
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