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.

A268645 Union of the factorial numbers (A000142) and the double factorials numbers (A006882).

Table of values

n a(n)
1 1
2 2
3 3
4 6
5 8
6 15
7 24
8 48
9 105
10 120
11 384
12 720
13 945
14 3840
15 5040
16 10395
17 40320
18 46080
19 135135
20 362880
21 645120
22 2027025
23 3628800
24 10321920
25 34459425
26 39916800
27 185794560
28 479001600
29 654729075
30 3715891200
31 6227020800
32 13749310575
33 81749606400
34 87178291200
35 316234143225
36 1307674368000

List of values

[1, 2, 3, 6, 8, 15, 24, 48, 105, 120, 384, 720, 945, 3840, 5040, 10395, 40320, 46080, 135135, 362880, 645120, 2027025, 3628800, 10321920, 34459425, 39916800, 185794560, 479001600, 654729075, 3715891200, 6227020800, 13749310575, 81749606400, 87178291200, 316234143225, 1307674368000]