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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.

A364327 Number of endofunctions on [n] such that the number of elements that are mapped to i is either 0 or a divisor of i.

Table of values

n a(n)
0 1
1 1
2 3
3 13
4 115
5 851
6 13431
7 144516
8 2782571
9 47046307
10 1107742273
11 19263747713
12 657152726011
13 13657313316986
14 451605697223110
15 13377063396461138
16 531234399267707419
17 14563460779785318719
18 721703507708044677945
19 22141894282020163910406
20 1123287408943765640907425

List of values

[1, 1, 3, 13, 115, 851, 13431, 144516, 2782571, 47046307, 1107742273, 19263747713, 657152726011, 13657313316986, 451605697223110, 13377063396461138, 531234399267707419, 14563460779785318719, 721703507708044677945, 22141894282020163910406, 1123287408943765640907425]

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

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