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A000891 as a simple table

na(n)
01
13
220
3175
41764
519404
6226512
72760615
834763300
9449141836
105924217936
1179483257308
121081724803600
1314901311070000
14207426250094400
152913690606794775
1641255439318353700
17588272005095043500

[1,3,20,175,1764,19404,226512,2760615,34763300,
 449141836,5924217936,79483257308,1081724803600,
 14901311070000,207426250094400,2913690606794775,
 41255439318353700,588272005095043500]