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.

A137775 Number of triples of permutations on n letters such that for each j, exactly one of the permutations fixes j and the other two have the same image on j.

Table of values

n a(n)
0 1
1 0
2 3
3 6
4 45
5 252
6 1935
7 16146
8 153657
9 1616760
10 18699579
11 235498590
12 3207570597
13 46968796404
14 735689606535
15 12272343940458
16 217191191400945
17 4064131571557104
18 80166987477918963
19 1662468879466624950
20 36156426996107254941
21 822876672690142595820

List of values

[1, 0, 3, 6, 45, 252, 1935, 16146, 153657, 1616760, 18699579, 235498590, 3207570597, 46968796404, 735689606535, 12272343940458, 217191191400945, 4064131571557104, 80166987477918963, 1662468879466624950, 36156426996107254941, 822876672690142595820]

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

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