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A207764 as a simple table

na(n)
19
281
3193
4663
51664
64018
711509
830943
979178
10213444
11574517
121510235
134016905
1410742833
1528499913
1675702647
17201719465
18536397481
191425655190
203793651190
2110091485607
2226833849671
2371376964346
24189863830540
25504956635718

[9,81,193,663,1664,4018,11509,30943,79178,213444,
 574517,1510235,4016905,10742833,28499913,75702647,
 201719465,536397481,1425655190,3793651190,
 10091485607,26833849671,71376964346,189863830540,
 504956635718]