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A007160 as a simple table

na(n)
11
220
3225
41925
514014
691728
7556920
83197700
917587350
1093486536
11483367885
122442687975
1312109051500
1459053512000
15283963030560
161348824395160
176338392712550
1829503515951000
19136173391604250

[1,20,225,1925,14014,91728,556920,3197700,
 17587350,93486536,483367885,2442687975,
 12109051500,59053512000,283963030560,
 1348824395160,6338392712550,29503515951000,
 136173391604250]