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A099021 as a simple table

n a(n)
0 1
1 1
2 4
3 24
4 198
5 2070
6 26160
7 387240
8 6565020
9 125341020
10 2659925520
11 62089917120
12 1580632348680
13 43571319671880
14 1292731109429760
15 41068078953501600
16 1390717740470058000
17 50003952605673066000
18 1902359109096675028800
19 76341746199227491382400

[1,1,4,24,198,2070,26160,387240,6565020,125341020,
 2659925520,62089917120,1580632348680,
 43571319671880,1292731109429760,41068078953501600,
 1390717740470058000,50003952605673066000,
 1902359109096675028800,76341746199227491382400]

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Last modified August 8 14:49 EDT 2024. Contains 375022 sequences. (Running on oeis4.)