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A121204 as a simple table

na(n)
00
10
220
3212
41768
513672
6102012
7745404
85374160
938400464
10272709604
111928498596
1213597146552
1395668307256
14672119557196
154717043931788
1633080342678944
17231867574534048
181624598900644788
1911379821699044980

[0,0,20,212,1768,13672,102012,745404,5374160,
 38400464,272709604,1928498596,13597146552,
 95668307256,672119557196,4717043931788,
 33080342678944,231867574534048,1624598900644788,
 11379821699044980]