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A052882
A simple grammar: rooted ordered set partitions.
+0
11
0, 1, 2, 9, 52, 375, 3246, 32781, 378344, 4912515, 70872610, 1124723193, 19471590876, 365190378735, 7376016877334, 159620144556645, 3684531055645648, 90366129593683035, 2346673806524446218
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 4 08:07 EST 2009. Contains 170310 sequences.
AT&T Labs Research
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