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A145143 as a simple table

n a(n)
2 1
3 1
4 2
5 6
6 144
7 1200
8 9960
9 89040
10 1231776
11 18325440
12 280100160
13 4415368320
14 78497147520
15 1538731434240
16 32250825734400
17 708789321676800
18 16531867860480000
19 410557135229337600
20 10800330695046144000
21 298418233851795456000
22 8641298765266642944000

[1,1,2,6,144,1200,9960,89040,1231776,18325440,
 280100160,4415368320,78497147520,1538731434240,
 32250825734400,708789321676800,16531867860480000,
 410557135229337600,10800330695046144000,
 298418233851795456000,8641298765266642944000]

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)