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.

A273325 Number of endofunctions on [2n] such that the minimal cardinality of the nonempty preimages equals n.

Table of values

n a(n)
0 1
1 2
2 36
3 300
4 1960
5 11340
6 60984
7 312312
8 1544400
9 7438860
10 35103640
11 162954792
12 746347056
13 3380195000
14 15164074800
15 67476121200
16 298135873440
17 1309153089420
18 5717335239000
19 24847720451400
20 107520292479600
21 463440029892840
22 1990477619679120
23 8521600803066000

List of values

[1, 2, 36, 300, 1960, 11340, 60984, 312312, 1544400, 7438860, 35103640, 162954792, 746347056, 3380195000, 15164074800, 67476121200, 298135873440, 1309153089420, 5717335239000, 24847720451400, 107520292479600, 463440029892840, 1990477619679120, 8521600803066000]

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

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