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.

A273732 Number of permutations of n elements divided by the number of quaternary heaps on n+1 elements.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 1
5 2
6 3
7 4
8 5
9 10
10 15
11 20
12 25
13 50
14 75
15 100
16 125
17 250
18 375
19 500
20 625
21 1500
22 2625
23 4000
24 5625
25 12500
26 20625
27 30000
28 40625
29 87500
30 140625
31 200000
32 265625
33 562500
34 890625
35 1250000
36 1640625
37 3937500
38 6890625
39 10500000
40 14765625
41 32812500
42 54140625

List of values

[1, 1, 1, 1, 1, 2, 3, 4, 5, 10, 15, 20, 25, 50, 75, 100, 125, 250, 375, 500, 625, 1500, 2625, 4000, 5625, 12500, 20625, 30000, 40625, 87500, 140625, 200000, 265625, 562500, 890625, 1250000, 1640625, 3937500, 6890625, 10500000, 14765625, 32812500, 54140625]

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

Content is available under The OEIS End-User License Agreement.