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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 49 |
| 3 | 70 |
| 4 | 192 |
| 5 | 577 |
| 6 | 1558 |
| 7 | 3910 |
| 8 | 10465 |
| 9 | 27679 |
| 10 | 70960 |
| 11 | 185085 |
| 12 | 482009 |
| 13 | 1244823 |
| 14 | 3230042 |
| 15 | 8373967 |
| 16 | 21665119 |
| 17 | 56140661 |
| 18 | 145406933 |
| 19 | 376386012 |
| 20 | 974846599 |
| 21 | 2524431274 |
| 22 | 6535798997 |
| 23 | 16924746068 |
| 24 | 43825543193 |
| 25 | 113474650030 |
| 26 | 293830839732 |
[13,49,70,192,577,1558,3910,10465,27679,70960, 185085,482009,1244823,3230042,8373967,21665119, 56140661,145406933,376386012,974846599,2524431274, 6535798997,16924746068,43825543193,113474650030, 293830839732] |