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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 101 |
| 6 | 297 |
| 7 | 1255 |
| 8 | 4565 |
| 9 | 10143 |
| 10 | 14883 |
| 11 | 21637 |
| 12 | 31185 |
| 13 | 44583 |
| 14 | 63261 |
| 15 | 173525 |
| 16 | 239943 |
| 17 | 329931 |
| 18 | 1121505 |
| 19 | 1505499 |
| 20 | 2679689 |
| 21 | 3554345 |
| 22 | 4697205 |
| 23 | 6185689 |
| 24 | 10619863 |
| 25 | 18004327 |
| 26 | 23338469 |
| 27 | 30167357 |
| 28 | 38887673 |
| 29 | 49995925 |
| 30 | 64112359 |
| 31 | 82010177 |
[1,3,7,15,101,297,1255,4565,10143,14883,21637, 31185,44583,63261,173525,239943,329931,1121505, 1505499,2679689,3554345,4697205,6185689,10619863, 18004327,23338469,30167357,38887673,49995925, 64112359,82010177] |