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A199938 as a simple table

na(n)
16
230
3142
4660
53042
613890
763260
8287514
91305394
105924042
1126877500
12121920302
13553009230
142508114154
1511375127276
1651589452156

[6,30,142,660,3042,13890,63260,287514,1305394,
 5924042,26877500,121920302,553009230,2508114154,
 11375127276,51589452156]