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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 131 |
| 5 | 2501 |
| 6 | 15573 |
| 7 | 705895 |
| 8 | 8388739 |
| 9 | 258280345 |
| 10 | 4000002503 |
| 11 | 259374246011 |
| 12 | 2972033498453 |
| 13 | 279577021469773 |
| 14 | 4762288640230761 |
| 15 | 233543408203127519 |
| 16 | 9223372036863164547 |
| 17 | 778579070010669895697 |
| 18 | 13115469358432437487707 |
| 19 | 1874292305362402347591139 |
[1,3,19,131,2501,15573,705895,8388739,258280345, 4000002503,259374246011,2972033498453, 279577021469773,4762288640230761, 233543408203127519,9223372036863164547, 778579070010669895697,13115469358432437487707, 1874292305362402347591139] |