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.

A331966 Number of lone-child-avoiding rooted semi-identity trees with n vertices.

Table of values

n a(n)
1 1
2 0
3 1
4 1
5 2
6 3
7 5
8 9
9 16
10 30
11 55
12 105
13 200
14 388
15 754
16 1483
17 2923
18 5807
19 11575
20 23190
21 46608
22 94043
23 190287
24 386214
25 785831
26 1602952
27 3276845
28 6712905
29 13778079
30 28330583
31 58350582
32 120370731
33 248676129
34 514459237
35 1065696295
36 2210302177
37 4589599429
38 9540623926

List of values

[1, 0, 1, 1, 2, 3, 5, 9, 16, 30, 55, 105, 200, 388, 754, 1483, 2923, 5807, 11575, 23190, 46608, 94043, 190287, 386214, 785831, 1602952, 3276845, 6712905, 13778079, 28330583, 58350582, 120370731, 248676129, 514459237, 1065696295, 2210302177, 4589599429, 9540623926]

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

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