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A000020 as a simple table

na(n)
12
21
32
42
56
66
718
816
948
1060
11176
12144
13630
14756
151800
162048
177710
187776
1927594
2024000
2184672
22120032
23356960
24276480
251296000
261719900
274202496
284741632
2918407808
3017820000
3169273666
3267108864
33211016256
34336849900
35929275200
36725594112
373697909056

[2,1,2,2,6,6,18,16,48,60,176,144,630,756,1800,
 2048,7710,7776,27594,24000,84672,120032,356960,
 276480,1296000,1719900,4202496,4741632,18407808,
 17820000,69273666,67108864,211016256,336849900,
 929275200,725594112,3697909056]