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.

A120690 Number of ordered finite sequences a_1 <= a_2 <= ... <= a_n of length n of positive integers less than or equal to n whose product is n!.

Table of values

n a(n)
0 1
1 1
2 1
3 1
4 2
5 2
6 6
7 6
8 13
9 33
10 97
11 97
12 306
13 306
14 896
15 2804
16 7974
17 7974
18 24929
19 24929
20 82612
21 263913
22 782310
23 782310
24 2692708
25 7705973
26 22901921
27 69066986
28 232517327
29 232517327
30 853599455
31 853599455
32 2737549933
33 8929178758
34 26621287019
35 90741181490
36 325528535021
37 325528535021

List of values

[1, 1, 1, 1, 2, 2, 6, 6, 13, 33, 97, 97, 306, 306, 896, 2804, 7974, 7974, 24929, 24929, 82612, 263913, 782310, 782310, 2692708, 7705973, 22901921, 69066986, 232517327, 232517327, 853599455, 853599455, 2737549933, 8929178758, 26621287019, 90741181490, 325528535021, 325528535021]

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

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