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A177420 as a simple table

na(n)
0221
12754
212456
377697
4589869
55333271
648222198
7218509695
83071851356
912683673552
1051137150880
11205353516864
12823023894144
133295315229952
1413187700226560
1552763679519744
16211080475305984
17844373415677952

[221,2754,12456,77697,589869,5333271,48222198,
 218509695,3071851356,12683673552,51137150880,
 205353516864,823023894144,3295315229952,
 13187700226560,52763679519744,211080475305984,
 844373415677952]