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A024420 as a simple table

na(n)
01
11
21
34
422
5108
6612
74416
836576
9331200
103319200
1136806400
12445046400
135813579520
1481716947200
151230656716800
1619761225523200
17336973967769600
186082189179494400
19115851849523200000
202322322137354240000
2148869666136023040000

[1,1,1,4,22,108,612,4416,36576,331200,3319200,
 36806400,445046400,5813579520,81716947200,
 1230656716800,19761225523200,336973967769600,
 6082189179494400,115851849523200000,
 2322322137354240000,48869666136023040000]