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.

A381469 Number of unlabeled 2,3 cacti (triangular cacti with bridges) rooted at a triangle with n triangles and every node contained in exactly one triangle.

Table of values

n a(n)
0 0
1 1
2 1
3 4
4 15
5 66
6 304
7 1503
8 7622
9 39856
10 212447
11 1151614
12 6324924
13 35127396
14 196917025
15 1112776860
16 6332114208
17 36252066562
18 208665030299
19 1206819559836
20 7009605269315
21 40871341270810
22 239144296550695
23 1403719120877546
24 8263431521645830
25 48774908707685849

List of values

[0, 1, 1, 4, 15, 66, 304, 1503, 7622, 39856, 212447, 1151614, 6324924, 35127396, 196917025, 1112776860, 6332114208, 36252066562, 208665030299, 1206819559836, 7009605269315, 40871341270810, 239144296550695, 1403719120877546, 8263431521645830, 48774908707685849]

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

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