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A022917 as a simple table

n a(n)
0 1
1 1
2 2
3 6
4 24
5 60
6 180
7 630
8 2520
9 7560
10 25200
11 92400
12 369600
13 1201200
14 4204200
15 15765750
16 63063000
17 214414200
18 771891120
19 2933186256
20 11732745024
21 41064607584
22 150570227808
23 577185873264
24 2308743493056
25 8245512475200

[1,1,2,6,24,60,180,630,2520,7560,25200,92400,
 369600,1201200,4204200,15765750,63063000,
 214414200,771891120,2933186256,11732745024,
 41064607584,150570227808,577185873264,
 2308743493056,8245512475200]

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Last modified June 21 14:00 EDT 2018. Contains 305620 sequences. (Running on oeis4.)