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.

A331488 Number of unlabeled lone-child-avoiding rooted trees with n vertices and more than two branches (of the root).

Table of values

n a(n)
1 0
2 0
3 0
4 1
5 1
6 2
7 3
8 6
9 10
10 20
11 36
12 70
13 134
14 263
15 513
16 1022
17 2030
18 4076
19 8203
20 16614
21 33738
22 68833
23 140796
24 288989
25 594621
26 1226781
27 2536532
28 5256303
29 10913196
30 22700682
31 47299699
32 98714362
33 206323140
34 431847121
35 905074333
36 1899247187
37 3990145833
38 8392281473

List of values

[0, 0, 0, 1, 1, 2, 3, 6, 10, 20, 36, 70, 134, 263, 513, 1022, 2030, 4076, 8203, 16614, 33738, 68833, 140796, 288989, 594621, 1226781, 2536532, 5256303, 10913196, 22700682, 47299699, 98714362, 206323140, 431847121, 905074333, 1899247187, 3990145833, 8392281473]

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

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