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A052858
A simple grammar.
+0
1
0, 0, 2, 3, 16, 65, 456, 3157, 28624, 276705, 3136240, 38531141, 528468744, 7837577761, 126588882616, 2194957583925, 40854219413536, 810192673705793, 17082845929433952, 381225135102420997
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified November 23 17:09 EST 2009. Contains 167438 sequences.
AT&T Labs Research
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