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A052813
A simple grammar.
+0
3
1, 1, 4, 27, 260, 3280, 51414, 965762, 21175496, 531317520, 15021531840, 472654558992, 16385500397496, 620612495460048, 25500923655523848, 1129909190812470840, 53705490284841870144, 2725878142900911376896
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 6 11:04 EST 2009. Contains 170427 sequences.
AT&T Labs Research
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