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A203417 as a simple table

n a(n)
1 1
2 3
3 15
4 140
5 700
6 2520
7 44352
8 2196480
9 47567520
10 634233600
11 51753461760
12 13984935444480
13 1448751906201600
14 82605199597240320
15 32797812715211980800
16 5296846753506734899200
17 483765735240908144640000
18 28985693293514522492928000

[1,3,15,140,700,2520,44352,2196480,47567520,
 634233600,51753461760,13984935444480,
 1448751906201600,82605199597240320,
 32797812715211980800,5296846753506734899200,
 483765735240908144640000,
 28985693293514522492928000]

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Last modified May 21 00:14 EDT 2024. Contains 372720 sequences. (Running on oeis4.)