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A145620 as a simple table

n a(n)
1 1
2 2
3 5
4 140
5 35
6 770
7 5005
8 40040
9 510510
10 646646
11 323323
12 29745716
13 14300825
14 12257850
15 59246275
16 29386152400
17 7346538100
18 77138650050
19 475688341975
20 24735793782700
21 253541886272675
22 21804602219450050
23 10902301109725025

[1,2,5,140,35,770,5005,40040,510510,646646,323323,
 29745716,14300825,12257850,59246275,29386152400,
 7346538100,77138650050,475688341975,
 24735793782700,253541886272675,21804602219450050,
 10902301109725025]

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Last modified November 11 22:31 EST 2019. Contains 329046 sequences. (Running on oeis4.)