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A331660 as a simple table

n a(n)
1 1
2 1
3 5
4 32
5 280
6 3280
7 49480
8 927560
9 21037640
10 566134160
11 17803754560
12 646052181520
13 26757321804880
14 1252934215973600
15 65791336312915520
16 3846554938702140320
17 248841434876849499040
18 17713758333248102781760
19 1380631354206969100115200

[1,1,5,32,280,3280,49480,927560,21037640,
 566134160,17803754560,646052181520,26757321804880,
 1252934215973600,65791336312915520,
 3846554938702140320,248841434876849499040,
 17713758333248102781760,1380631354206969100115200]

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Last modified April 23 03:30 EDT 2024. Contains 371906 sequences. (Running on oeis4.)