A318900 - cp's OEIS frontend

A318900 Number of n-node rooted trees in which four equals the maximal number of nodes in paths starting at a leaf and ending at the first branching node or at the root.

n	a(n)
4	1
5	1
6	3
7	8
8	21
9	56
10	152
11	413
12	1131
13	3113
14	8603
15	23861
16	66386
17	185190
18	517807
19	1450836
20	4072474
21	11450141
22	32240466
23	90901507
24	256605905
25	725176409
26	2051455548
27	5808817638
28	16462274560
29	46691893949
30	132531324274
31	376443234567
32	1069953746735
33	3042969864371

[1, 1, 3, 8, 21, 56, 152, 413, 1131, 3113, 8603, 23861, 66386, 185190, 517807, 1450836, 4072474, 11450141, 32240466, 90901507, 256605905, 725176409, 2051455548, 5808817638, 16462274560, 46691893949, 132531324274, 376443234567, 1069953746735, 3042969864371]

cp's OEIS Frontend

A318900 Number of n-node rooted trees in which four equals the maximal number of nodes in paths starting at a leaf and ending at the first branching node or at the root.

Table of values

List of values