cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A153829 Index sequence to A089840: positions of bijections that preserve A153835, or equivalently, A127302 (the non-oriented form of binary trees).

Table of values

n a(n)
0 0
1 1
2 3
3 7
4 15
5 21
6 27
7 46
8 68
9 73
10 74
11 83
12 84
13 87
14 88
15 92
16 114
17 149
18 169
19 183
20 184
21 189
22 190
23 199
24 202
25 203
26 225
27 251
28 252
29 254
30 261
31 262
32 268
33 269
34 270
35 271
36 299
37 400
38 515
39 537
40 539
41 573
42 575
43 591
44 593
45 638
46 753
47 871
48 894
49 895
50 990
51 995
52 996
53 1110
54 1132

List of values

[0, 1, 3, 7, 15, 21, 27, 46, 68, 73, 74, 83, 84, 87, 88, 92, 114, 149, 169, 183, 184, 189, 190, 199, 202, 203, 225, 251, 252, 254, 261, 262, 268, 269, 270, 271, 299, 400, 515, 537, 539, 573, 575, 591, 593, 638, 753, 871, 894, 895, 990, 995, 996, 1110, 1132]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.