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A012541 as a simple table

na(n)
00
12
28
3320
415808
51671808
6242521600
752294963968
814823920529408
95496196568825856
102548323017071149056
111453790822661022908416
12997862723859007908085760
13812410035086507459409412096

[0,2,8,320,15808,1671808,242521600,52294963968,
 14823920529408,5496196568825856,
 2548323017071149056,1453790822661022908416,
 997862723859007908085760,
 812410035086507459409412096]