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A183730 as a simple table

na(n)
10
221
3563
49403
5135578
61814815
723204876
8287769879
93491293862
1041667398364
11490998416023
125727556631915
1366266101711488
14761498455531330
158701271226331052
1698948856313647335
171120614615517688964

[0,21,563,9403,135578,1814815,23204876,287769879,
 3491293862,41667398364,490998416023,5727556631915,
 66266101711488,761498455531330,8701271226331052,
 98948856313647335,1120614615517688964]