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A007553 as a simple table

n a(n)
1 1
2 1
3 1
4 1
5 7
6 5
7 85
8 335
9 1135
10 15245
11 13475
12 717575
13 4256825
14 29782325
15 525045275
16 243258625
17 56809006625
18 415670267875
19 5068080417875
20 104229929847625
21 60861649495625
22 20784245979986875
23 169274937975443125
24 3318579283890780625
25 75028912866554839375

[1,1,1,1,7,5,85,335,1135,15245,13475,717575,
 4256825,29782325,525045275,243258625,56809006625,
 415670267875,5068080417875,104229929847625,
 60861649495625,20784245979986875,
 169274937975443125,3318579283890780625,
 75028912866554839375]

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Last modified June 14 15:19 EDT 2021. Contains 345025 sequences. (Running on oeis4.)