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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 19 |
| 5 | 379 |
| 6 | 379 |
| 7 | 3539 |
| 8 | 3539 |
| 9 | 42461 |
| 10 | 42461 |
| 11 | 1868459 |
| 12 | 1868459 |
| 13 | 32384089 |
| 14 | 32384089 |
| 15 | 388644103 |
| 16 | 388644103 |
| 17 | 26424178387 |
| 18 | 26424178387 |
| 19 | 669590253599 |
| 20 | 669590253599 |
| 21 | 1605990140413 |
| 22 | 1605990140413 |
| 23 | 148027376624695 |
| 24 | 148027376624695 |
| 25 | 980410698447157 |
[0,1,3,19,19,379,379,3539,3539,42461,42461, 1868459,1868459,32384089,32384089,388644103, 388644103,26424178387,26424178387,669590253599, 669590253599,1605990140413,1605990140413, 148027376624695,148027376624695,980410698447157] |