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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 39 |
| 3 | 40 |
| 4 | 1559 |
| 5 | 1599 |
| 6 | 62321 |
| 7 | 63920 |
| 8 | 2491281 |
| 9 | 2555201 |
| 10 | 99588919 |
| 11 | 102144120 |
| 12 | 3981065479 |
| 13 | 4083209599 |
| 14 | 159143030241 |
| 15 | 163226239840 |
| 16 | 6361740144161 |
| 17 | 6524966384001 |
| 18 | 254310462736199 |
| 19 | 260835429120200 |
| 20 | 10166056769303799 |
| 21 | 10426892198423999 |
[1,1,39,40,1559,1599,62321,63920,2491281,2555201, 99588919,102144120,3981065479,4083209599, 159143030241,163226239840,6361740144161, 6524966384001,254310462736199,260835429120200, 10166056769303799,10426892198423999] |