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A087137 as a simple table

n a(n)
0 0
1 1
2 1
3 6
4 15
5 120
6 495
7 5040
8 29295
9 362880
10 2735775
11 39916800
12 370945575
13 6227020800
14 68916822975
15 1307674368000
16 16813959537375
17 355687428096000
18 5214921734397375
19 121645100408832000
20 2004231846526284375
21 51090942171709440000
22 934957186489800849375

[0,1,1,6,15,120,495,5040,29295,362880,2735775,
 39916800,370945575,6227020800,68916822975,
 1307674368000,16813959537375,355687428096000,
 5214921734397375,121645100408832000,
 2004231846526284375,51090942171709440000,
 934957186489800849375]

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Last modified April 20 17:54 EDT 2019. Contains 322310 sequences. (Running on oeis4.)