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A176688 as a simple table

na(n)
21
38
444
5215
61028
75040
825931
9141394
10818940
115030489
1232670830
13223561960
141606504121
1512086613500
1694951417768
17777028092855
186609770035768
1958333927746852
20533203742855027
215039919479205198
2249191925330095240

[1,8,44,215,1028,5040,25931,141394,818940,5030489,
 32670830,223561960,1606504121,12086613500,
 94951417768,777028092855,6609770035768,
 58333927746852,533203742855027,5039919479205198,
 49191925330095240]