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A009605 as a simple table

n a(n)
0 0
1 1
2 2
3 6
4 16
5 72
6 288
7 1848
8 9920
9 81088
10 541184
11 5318016
12 42274816
13 483162240
14 4449451776
15 57865303296
16 605255720960
17 8815813734400
18 103187353223168
19 1662921003208704
20 21528004660707328
21 380141599264751616
22 5391886872902762496
23 103492751953073897472

[0,1,2,6,16,72,288,1848,9920,81088,541184,5318016,
 42274816,483162240,4449451776,57865303296,
 605255720960,8815813734400,103187353223168,
 1662921003208704,21528004660707328,
 380141599264751616,5391886872902762496,
 103492751953073897472]

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Last modified May 30 06:59 EDT 2024. Contains 372962 sequences. (Running on oeis4.)