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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.

A263529 Binomial transform of double factorial n!! (A006882).

Table of values

n a(n)
0 1
1 2
2 5
3 13
4 37
5 111
6 355
7 1191
8 4201
9 15445
10 59171
11 234983
12 966397
13 4101709
14 17946783
15 80754331
16 373286481
17 1769440513
18 8592681907
19 42689422871
20 216789872741
21 1124107246669
22 5947013363479
23 32071798826115
24 176194545585529
25 985330955637801
26 5605802379087067

List of values

[1, 2, 5, 13, 37, 111, 355, 1191, 4201, 15445, 59171, 234983, 966397, 4101709, 17946783, 80754331, 373286481, 1769440513, 8592681907, 42689422871, 216789872741, 1124107246669, 5947013363479, 32071798826115, 176194545585529, 985330955637801, 5605802379087067]

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

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