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A028228 as a simple table

na(n)
01
140
21007
320414
4364329
55979036
692485219
71369339018
819606630637
9273438929192
103733694351751
1150109751007862
12662977655746225
138667106208101108
14112162143040653803
151438993526155501346

[1,40,1007,20414,364329,5979036,92485219,
 1369339018,19606630637,273438929192,3733694351751,
 50109751007862,662977655746225,8667106208101108,
 112162143040653803,1438993526155501346]