A248100 - cp's OEIS frontend

A248100 Number of ordered trees with n edges such that non-leaf vertices at even levels have outdegree 1 and those at odd levels have outdegree 2.

n	a(n)
0	1
1	1
2	0
3	1
4	2
5	1
6	2
7	6
8	6
9	7
10	20
11	30
12	34
13	75
14	140
15	182
16	322
17	644
18	972
19	1554
20	3024
21	5091
22	8052
23	14784
24	26378
25	43032
26	75504
27	136994
28	232232
29	399399
30	720356
31	1257256
32	2161874
33	3852576
34	6831552
35	11858418
36	20949304
37	37350768
38	65554788
39	115476376
40	205872448

[1, 1, 0, 1, 2, 1, 2, 6, 6, 7, 20, 30, 34, 75, 140, 182, 322, 644, 972, 1554, 3024, 5091, 8052, 14784, 26378, 43032, 75504, 136994, 232232, 399399, 720356, 1257256, 2161874, 3852576, 6831552, 11858418, 20949304, 37350768, 65554788, 115476376, 205872448]

cp's OEIS Frontend

A248100 Number of ordered trees with n edges such that non-leaf vertices at even levels have outdegree 1 and those at odd levels have outdegree 2.

Table of values

List of values