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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 9 |
| 2 | 24 |
| 3 | 69 |
| 4 | 222 |
| 5 | 783 |
| 6 | 2928 |
| 7 | 11313 |
| 8 | 44466 |
| 9 | 176307 |
| 10 | 702132 |
| 11 | 2802357 |
| 12 | 11197110 |
| 13 | 44763831 |
| 14 | 179006136 |
| 15 | 715926201 |
| 16 | 2863508154 |
| 17 | 11453639355 |
| 18 | 45813770940 |
| 19 | 183253510845 |
| 20 | 733010897598 |
| 21 | 2932037298879 |
| 22 | 11728136612544 |
| 23 | 46912521284289 |
| 24 | 187650034805442 |
| 25 | 750600038558403 |
[3,9,24,69,222,783,2928,11313,44466,176307,702132, 2802357,11197110,44763831,179006136,715926201, 2863508154,11453639355,45813770940,183253510845, 733010897598,2932037298879,11728136612544, 46912521284289,187650034805442,750600038558403] |