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| n | a(n) |
|---|---|
| 2 | 4 |
| 3 | 15 |
| 4 | 39 |
| 5 | 87 |
| 6 | 183 |
| 7 | 2071 |
| 8 | 1255 |
| 9 | 1527 |
| 10 | 3063 |
| 11 | 38551 |
| 12 | 12279 |
| 13 | 106327 |
| 14 | 49143 |
| 15 | 622231 |
| 16 | 1113823 |
| 17 | 1703767 |
| 18 | 1310695 |
| 19 | 9961111 |
| 20 | 3145719 |
| 21 | 39845527 |
| 22 | 12582903 |
| 23 | 310377127 |
| 24 | 50331639 |
| 25 | 2046816631 |
| 26 | 335544295 |
| 27 | 10603194271 |
| 28 | 23890747663 |
| 29 | 1610612727 |
| 30 | 44023413103 |
[4,15,39,87,183,2071,1255,1527,3063,38551,12279, 106327,49143,622231,1113823,1703767,1310695, 9961111,3145719,39845527,12582903,310377127, 50331639,2046816631,335544295,10603194271, 23890747663,1610612727,44023413103] |