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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.

A360717 Number of unordered pairs of self-avoiding paths whose sets of nodes are disjoint subsets of a set of n points on a circle; one-node paths are allowed.

Table of values

n a(n)
1 0
2 1
3 6
4 33
5 185
6 1050
7 6027
8 35014
9 205326
10 1209375
11 7119860
12 41744703
13 243218703
14 1406685280
15 8073640785
16 45991600860
17 260131208396
18 1461591509805
19 8162196518322
20 45327133739245
21 250431036147285
22 1377169337010390
23 7540979990097191
24 41130452834689218
25 223528009015333050
26 1210753768099880875
27 6537995998163877312

List of values

[0, 1, 6, 33, 185, 1050, 6027, 35014, 205326, 1209375, 7119860, 41744703, 243218703, 1406685280, 8073640785, 45991600860, 260131208396, 1461591509805, 8162196518322, 45327133739245, 250431036147285, 1377169337010390, 7540979990097191, 41130452834689218, 223528009015333050, 1210753768099880875, 6537995998163877312]

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

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