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A208735 as a simple table

na(n)
01
14
220
3130
41070
510738
6127316
71741705
827003335
9467906045
108961068424
11187959552998
124285257122545
13105513858706830
142790444044794960

[1,4,20,130,1070,10738,127316,1741705,27003335,
 467906045,8961068424,187959552998,4285257122545,
 105513858706830,2790444044794960]