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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 37 |
| 3 | 173 |
| 4 | 757 |
| 5 | 3197 |
| 6 | 12697 |
| 7 | 51677 |
| 8 | 206509 |
| 9 | 826897 |
| 10 | 3315513 |
| 11 | 13257725 |
| 12 | 53074973 |
| 13 | 212356073 |
| 14 | 849467157 |
| 15 | 3397783865 |
[1,5,37,173,757,3197,12697,51677,206509,826897, 3315513,13257725,53074973,212356073,849467157, 3397783865] |