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A052890
A simple grammar.
+0
1
1, 1, 2, 6, 16, 49, 153, 493, 1623, 5460, 18625, 64373, 224843, 792546, 2815443, 10070115, 36233440, 131063713, 476320360, 1738401482, 6368750019
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
AT&T Labs Research
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