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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.

A293459 Denominator of probability that a permutation of elements of some subset of set {1,2..n} is a permutation of elements of some set of the form 1..k, k <= n.

Table of values

n a(n)
1 1
2 1
3 7
4 385
5 3628921
6 1216452311762688721
7 10333147966386144929717742279694909445041
8 5989285834984945898036392571843137173092920925318860392502631168811983977451725959000900501504040321

List of values

[1, 1, 7, 385, 3628921, 1216452311762688721, 10333147966386144929717742279694909445041, 5989285834984945898036392571843137173092920925318860392502631168811983977451725959000900501504040321]

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

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