A384748 - cp's OEIS frontend

A384748 Number of rooted ordered trees with node weights summing to n, where the root has weight 0, non-root node weights are greater than 0, and no nodes have the same weight as their parent node.

n	a(n)
0	1
1	1
2	2
3	6
4	16
5	44
6	128
7	376
8	1114
9	3346
10	10152
11	31028
12	95474
13	295532
14	919446
15	2873388
16	9015812
17	28390466
18	89689586
19	284173096
20	902780060
21	2875016084
22	9176388532
23	29349499212
24	94050228650
25	301918397716
26	970815092346

[1, 1, 2, 6, 16, 44, 128, 376, 1114, 3346, 10152, 31028, 95474, 295532, 919446, 2873388, 9015812, 28390466, 89689586, 284173096, 902780060, 2875016084, 9176388532, 29349499212, 94050228650, 301918397716, 970815092346]

cp's OEIS Frontend

A384748 Number of rooted ordered trees with node weights summing to n, where the root has weight 0, non-root node weights are greater than 0, and no nodes have the same weight as their parent node.

Table of values

List of values