A124499 - cp's OEIS frontend

A124499 Number of 1-2-3-4 trees with n edges and with thinning limbs. A 1-2-3-4 tree is an ordered tree with vertices of outdegree at most 4. A rooted tree with thinning limbs is such that if a node has k children, all its children have at most k children.

n	a(n)
0	1
1	1
2	2
3	4
4	10
5	24
6	62
7	160
8	425
9	1140
10	3105
11	8528
12	23643
13	66008
14	185526
15	524384
16	1489810
17	4251852
18	12184745
19	35048405
20	101156752
21	292865417
22	850314803
23	2475327088
24	7223400899
25	21126670372
26	61920289652
27	181838859665

[1, 1, 2, 4, 10, 24, 62, 160, 425, 1140, 3105, 8528, 23643, 66008, 185526, 524384, 1489810, 4251852, 12184745, 35048405, 101156752, 292865417, 850314803, 2475327088, 7223400899, 21126670372, 61920289652, 181838859665]

cp's OEIS Frontend

A124499 Number of 1-2-3-4 trees with n edges and with thinning limbs. A 1-2-3-4 tree is an ordered tree with vertices of outdegree at most 4. A rooted tree with thinning limbs is such that if a node has k children, all its children have at most k children.

Table of values

List of values