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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.

A193229 A double factorial triangle.

Table of values

n a(n)
0 1
1 1
2 1
3 3
4 3
5 2
6 15
7 15
8 12
9 6
10 105
11 105
12 90
13 60
14 24
15 945
16 945
17 840
18 630
19 360
20 120
21 10395
22 10395
23 9450
24 7560
25 5040
26 2520
27 720
28 135135
29 135135
30 124740
31 103950
32 75600
33 45360
34 20160
35 5040
36 2027025
37 2027025
38 1891890
39 1621620
40 1247400
41 831600
42 453600
43 181440
44 40320

List of values

[1, 1, 1, 3, 3, 2, 15, 15, 12, 6, 105, 105, 90, 60, 24, 945, 945, 840, 630, 360, 120, 10395, 10395, 9450, 7560, 5040, 2520, 720, 135135, 135135, 124740, 103950, 75600, 45360, 20160, 5040, 2027025, 2027025, 1891890, 1621620, 1247400, 831600, 453600, 181440, 40320]

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

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