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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 25 |
| 4 | 37 |
| 5 | 493 |
| 6 | 949 |
| 7 | 1405 |
| 8 | 18721 |
| 9 | 36037 |
| 10 | 53353 |
| 11 | 710905 |
| 12 | 1368457 |
| 13 | 2026009 |
| 14 | 26995669 |
| 15 | 51965329 |
| 16 | 76934989 |
| 17 | 1025124517 |
| 18 | 1973314045 |
| 19 | 2921503573 |
| 20 | 38927735977 |
| 21 | 74933968381 |
| 22 | 110940200785 |
| 23 | 1478228842609 |
| 24 | 2845517484433 |
| 25 | 4212806126257 |
[1,13,25,37,493,949,1405,18721,36037,53353,710905, 1368457,2026009,26995669,51965329,76934989, 1025124517,1973314045,2921503573,38927735977, 74933968381,110940200785,1478228842609, 2845517484433,4212806126257] |