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A173622 as a simple table

na(n)
21
36
421
530
6180
7546
8140
91430
106120
1117710
12630
1310920
1465835
15245700
16695640
172772
1881396
19690690
203322704
2111515140
2232212719
2312012
24596904
257125300
2644170896
27187336380
28619851960
291721286532
3051480
314326300
3272624816

[1,6,21,30,180,546,140,1430,6120,17710,630,10920,
 65835,245700,695640,2772,81396,690690,3322704,
 11515140,32212719,12012,596904,7125300,44170896,
 187336380,619851960,1721286532,51480,4326300,
 72624816]