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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.

A322153 Number of permutations of 3 indistinguishable copies of 1,...,n such that there are exactly j numbers between the first and the third copy of j and floor(j/2) numbers between the second and the third copy of j.

Table of values

n a(n)
0 1
1 1
2 0
3 0
4 0
5 0
6 5
7 12
8 0
9 0
10 0
11 0
12 2967
13 13275
14 0
15 0
16 0
17 0
18 38182584
19 222784153
20 0
21 0
22 0
23 0

List of values

[1, 1, 0, 0, 0, 0, 5, 12, 0, 0, 0, 0, 2967, 13275, 0, 0, 0, 0, 38182584, 222784153, 0, 0, 0, 0]

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

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