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A002670 as a simple table

n a(n)
1 1
2 2
3 12
4 72
5 240
6 2400
7 907200
8 4233600
9 25401600
10 1371686400
11 251475840000
12 5532468480000
13 554827553280000
14 33659538232320000
15 73302994372608000
16 4453156908135936000000
17 50469111625540608000000
18 63553696121051136000000

[1,2,12,72,240,2400,907200,4233600,25401600,
 1371686400,251475840000,5532468480000,
 554827553280000,33659538232320000,
 73302994372608000,4453156908135936000000,
 50469111625540608000000,63553696121051136000000]

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Last modified September 18 19:30 EDT 2021. Contains 347534 sequences. (Running on oeis4.)