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A202203 as a simple table

n a(n)
0 1
1 1
2 1
3 5
4 12
5 74
6 420
7 2904
8 19880
9 210384
10 1844640
11 20910240
12 242478720
13 3193551360
14 41853651840
15 682405788960
16 9824634892800
17 173309920358400
18 3095955573419520
19 58684751375685120
20 1111152812649062400
21 24883693662159360000
22 514031737571893094400

[1,1,1,5,12,74,420,2904,19880,210384,1844640,
 20910240,242478720,3193551360,41853651840,
 682405788960,9824634892800,173309920358400,
 3095955573419520,58684751375685120,
 1111152812649062400,24883693662159360000,
 514031737571893094400]

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Last modified August 12 07:38 EDT 2020. Contains 336438 sequences. (Running on oeis4.)