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A092691 as a simple table

n a(n)
0 0
1 0
2 1
3 3
4 18
5 90
6 660
7 4620
8 42000
9 378000
10 4142880
11 45571680
12 586776960
13 7628100480
14 113020427520
15 1695306412800
16 28432576972800
17 483353808537600
18 9056055981772800
19 172065063653683200
20 3562946373482496000
21 74821873843132416000
22 1697172166720622592000

[0,0,1,3,18,90,660,4620,42000,378000,4142880,
 45571680,586776960,7628100480,113020427520,
 1695306412800,28432576972800,483353808537600,
 9056055981772800,172065063653683200,
 3562946373482496000,74821873843132416000,
 1697172166720622592000]

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Last modified March 21 18:59 EDT 2019. Contains 321382 sequences. (Running on oeis4.)