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A002776 as a simple table

na(n)
01
15
234
3258
42136
519320
6190800
72051280
823909760
9300827520
104067884800
1158877280000
12908666035200
1314901260774400
14258832346572800
154748165630208000
1691746433658880000
171862735060938752000
1839649900359573504000
19883021783867711488000

[1,5,34,258,2136,19320,190800,2051280,23909760,
 300827520,4067884800,58877280000,908666035200,
 14901260774400,258832346572800,4748165630208000,
 91746433658880000,1862735060938752000,
 39649900359573504000,883021783867711488000]