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A124497
Number of 1-2-3 trees with n edges and with thinning limbs. A 1-2-3 tree is an ordered tree with vertices of outdegree at most 3. A rooted tree with thinning limbs is such that if a node has k children, all its children have at most k children.
+0
5
1, 1, 2, 4, 9, 20, 48, 116, 288, 724, 1849, 4768, 12423, 32628, 86342, 229952, 616042, 1659012, 4489101, 12199521, 33284546, 91140797, 250396629, 690043032, 1907022197, 5284167884, 14677681554, 40862469713, 114001697975
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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 18 21:37 EST 2009. Contains 171024 sequences.
AT&T Labs Research
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