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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 15 |
| 5 | 35 |
| 6 | 79 |
| 7 | 193 |
| 8 | 493 |
| 9 | 1299 |
| 10 | 3429 |
| 11 | 9049 |
| 12 | 23699 |
| 13 | 62271 |
| 14 | 163997 |
| 15 | 433433 |
| 16 | 1147659 |
| 17 | 3040899 |
[0,1,3,7,15,35,79,193,493,1299,3429,9049,23699, 62271,163997,433433,1147659,3040899] |