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.

A003080 Number of rooted triangular cacti with 2n+1 nodes (n triangles).

Table of values

n a(n)
0 1
1 1
2 2
3 5
4 13
5 37
6 111
7 345
8 1105
9 3624
10 12099
11 41000
12 140647
13 487440
14 1704115
15 6002600
16 21282235
17 75890812
18 272000538
19 979310627
20 3540297130
21 12845634348
22 46764904745
23 170767429511
24 625314778963
25 2295635155206
26 8447553316546
27 31153444946778
28 115122389065883

List of values

[1, 1, 2, 5, 13, 37, 111, 345, 1105, 3624, 12099, 41000, 140647, 487440, 1704115, 6002600, 21282235, 75890812, 272000538, 979310627, 3540297130, 12845634348, 46764904745, 170767429511, 625314778963, 2295635155206, 8447553316546, 31153444946778, 115122389065883]

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

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