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A180374 as a simple table

na(n)
11
221
3156
41236
59552
674568
7579792
84515312
935141952
10273573984
112129509056
1216576843584
13129037857024
141004466036864
157819018652928
1660865289156352
17473791157511168
183688113552987648
1928709232900123648
20223480124314162176

[1,21,156,1236,9552,74568,579792,4515312,35141952,
 273573984,2129509056,16576843584,129037857024,
 1004466036864,7819018652928,60865289156352,
 473791157511168,3688113552987648,
 28709232900123648,223480124314162176]