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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 17 |
| 5 | 41 |
| 6 | 101 |
| 7 | 259 |
| 8 | 669 |
| 9 | 1731 |
| 10 | 4499 |
| 11 | 11705 |
| 12 | 30623 |
| 13 | 80443 |
| 14 | 211851 |
| 15 | 558999 |
| 16 | 1477983 |
| 17 | 3914393 |
| 18 | 10384023 |
| 19 | 27585099 |
| 20 | 73366563 |
| 21 | 195341557 |
| 22 | 520640553 |
[1,3,7,17,41,101,259,669,1731,4499,11705,30623, 80443,211851,558999,1477983,3914393,10384023, 27585099,73366563,195341557,520640553] |