A153830 - cp's OEIS frontend

A153830 Index sequence to A089840: positions of bijections that preserve A127302 (the non-oriented form of binary trees) and whose behavior does not depend on whether there are internal or terminal nodes (leaves) in the neighborhood of any vertex.

n	a(n)
0	0
1	1
2	3
3	7
4	15
5	21
6	27
7	46
8	92
9	114
10	149
11	169
12	225
13	251
14	299
15	400
16	638
17	753
18	1233
19	1348
20	1705
21	1823
22	1992
23	2097
24	2335
25	2451
26	2995
27	3128
28	3485
29	3607
30	3677
31	3771
32	4214
33	4307
34	4631
35	5254
36	6692
37	7393
38	10287
39	10988
40	13145
41	13860
42	20353
43	21054

[0, 1, 3, 7, 15, 21, 27, 46, 92, 114, 149, 169, 225, 251, 299, 400, 638, 753, 1233, 1348, 1705, 1823, 1992, 2097, 2335, 2451, 2995, 3128, 3485, 3607, 3677, 3771, 4214, 4307, 4631, 5254, 6692, 7393, 10287, 10988, 13145, 13860, 20353, 21054]

cp's OEIS Frontend

A153830 Index sequence to A089840: positions of bijections that preserve A127302 (the non-oriented form of binary trees) and whose behavior does not depend on whether there are internal or terminal nodes (leaves) in the neighborhood of any vertex.

Table of values

List of values