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A080687 as a simple table

n a(n)
0 1
1 1
2 3
3 18
4 174
5 2370
6 41850
7 908460
8 23393160
9 696752280
10 23558056200
11 891259815600
12 37298874135600
13 1710662148795600
14 85319825069278800
15 4597474487169564000
16 266164417718126928000
17 16475817276720193392000

[1,1,3,18,174,2370,41850,908460,23393160,
 696752280,23558056200,891259815600,37298874135600,
 1710662148795600,85319825069278800,
 4597474487169564000,266164417718126928000,
 16475817276720193392000]

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Last modified April 16 11:48 EDT 2024. Contains 371711 sequences. (Running on oeis4.)