| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 25 |
| 5 | 27 |
| 6 | 91 |
| 7 | 231 |
| 8 | 455 |
| 9 | 1135 |
| 10 | 2693 |
| 11 | 6041 |
| 12 | 14257 |
| 13 | 33349 |
| 14 | 76941 |
| 15 | 179553 |
| 16 | 418345 |
| 17 | 971503 |
| 18 | 2261807 |
| 19 | 5264419 |
| 20 | 12243481 |
| 21 | 28490729 |
| 22 | 66295633 |
| 23 | 154236017 |
| 24 | 358872825 |
| 25 | 835013523 |
| 26 | 1942797397 |
| 27 | 4520363539 |
| 28 | 10517663443 |
| 29 | 24471508585 |
| 30 | 56938341019 |
[1,1,7,25,27,91,231,455,1135,2693,6041,14257, 33349,76941,179553,418345,971503,2261807,5264419, 12243481,28490729,66295633,154236017,358872825, 835013523,1942797397,4520363539,10517663443, 24471508585,56938341019] |