A173383 - OEIS

A173383

Partial sums of A000014.

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

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OFFSET

0,3

COMMENTS

Number of series-reduced trees with <= n nodes.

LINKS

Table of n, a(n) for n=0..41.

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