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A068311 as a simple table

n a(n)
0 0
1 0
2 1
3 5
4 44
5 244
6 2064
7 15168
8 181824
9 1878336
10 21323520
11 238187520
12 3496919040
13 45938949120
14 699188474880
15 11185253452800
16 220809635020800
17 3774686585241600
18 75413794524364800
19 1439264469668659200
20 31704771803185152000
21 690129227948654592000

[0,0,1,5,44,244,2064,15168,181824,1878336,
 21323520,238187520,3496919040,45938949120,
 699188474880,11185253452800,220809635020800,
 3774686585241600,75413794524364800,
 1439264469668659200,31704771803185152000,
 690129227948654592000]

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Last modified May 12 19:25 EDT 2024. Contains 372494 sequences. (Running on oeis4.)