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A281983 as a simple table

na(n)
10
22
3121
41054
57053
641118
7226025
81189600
96090935
1030538028
11150719259
12734621288
133544728240
1416962264274
1580602719361
16380741691862
171789303173765
188371399843188
1939012925707604
20181180019619130
21838816233474674

[0,2,121,1054,7053,41118,226025,1189600,6090935,
 30538028,150719259,734621288,3544728240,
 16962264274,80602719361,380741691862,
 1789303173765,8371399843188,39012925707604,
 181180019619130,838816233474674]