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A152827 as a simple table

n a(n)
0 1
1 1
2 1
3 2
4 4
5 12
6 48
7 240
8 1440
9 11520
10 115200
11 1382400
12 20736000
13 373248000
14 8211456000
15 221709312000
16 7094697984000
17 269598523392000
18 12401532076032000
19 669682732105728000
20 42859694854766592000

[1,1,1,2,4,12,48,240,1440,11520,115200,1382400,
 20736000,373248000,8211456000,221709312000,
 7094697984000,269598523392000,12401532076032000,
 669682732105728000,42859694854766592000]

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Last modified May 15 20:14 EDT 2024. Contains 372549 sequences. (Running on oeis4.)