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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.

A324361 Total number of occurrences of n in the (signed) displacement sets of all permutations of [2n] divided by n!.

Table of values

n a(n)
0 0
1 1
2 5
3 49
4 679
5 12151
6 266321
7 6906257
8 206788751
9 7020426511
10 266464077769
11 11180868467209
12 513915970996583
13 25678820830238759
14 1385874945753239969
15 80341660921985676961
16 4979071555472111291551
17 328496221117149603559327
18 22987138271050177264124441

List of values

[0, 1, 5, 49, 679, 12151, 266321, 6906257, 206788751, 7020426511, 266464077769, 11180868467209, 513915970996583, 25678820830238759, 1385874945753239969, 80341660921985676961, 4979071555472111291551, 328496221117149603559327, 22987138271050177264124441]

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

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