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A173383 Partial sums of A000014. 0
0, 1, 2, 2, 3, 4, 6, 8, 12, 17, 27, 41, 67, 109, 187, 319, 568, 1013, 1855, 3416, 6404, 12075, 23056, 44265, 85737, 166918, 327094, 643843, 1273776, 2529846, 5045015, 10094831, 20267469, 40811048, 82413473, 166854359, 338648851, 688887026, 1404384063, 2868791176, 5871429462, 12038444069 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
Number of series-reduced trees with <= n nodes.
LINKS
FORMULA
a(n) = Sum_{k=0..n} A000014(k).
CROSSREFS
Cf. A000014, A000055 (trees), A001678 (series-reduced planted trees), A007827 (series-reduced trees by leaves).
Sequence in context: A332755 A017912 A102543 * A316076 A368746 A325832
KEYWORD
easy,nonn
AUTHOR
Jonathan Vos Post, Feb 17 2010
EXTENSIONS
a(3)=2 inserted and edited by Georg Fischer, Sep 14 2021
STATUS
approved

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Last modified March 28 12:59 EDT 2024. Contains 371254 sequences. (Running on oeis4.)