| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 6 |
| 3 | 15 |
| 4 | 33 |
| 5 | 60 |
| 6 | 81 |
| 7 | 189 |
| 8 | 378 |
| 9 | 675 |
| 10 | 459 |
| 11 | 1107 |
| 12 | 2349 |
| 13 | 4509 |
| 14 | 7992 |
| 15 | 2673 |
| 16 | 6588 |
| 17 | 14553 |
| 18 | 29403 |
| 19 | 55188 |
| 20 | 97416 |
| 21 | 15849 |
| 22 | 39663 |
| 23 | 90207 |
| 24 | 189351 |
| 25 | 371358 |
| 26 | 687258 |
| 27 | 1209951 |
| 28 | 95175 |
| 29 | 240894 |
| 30 | 560115 |
| 31 | 1211031 |
| 32 | 2458998 |
| 33 | 4727565 |
| 34 | 8664813 |
| 35 | 15227190 |
| 36 | 576963 |
| 37 | 1473147 |
| 38 | 3485187 |
[1,3,6,15,33,60,81,189,378,675,459,1107,2349,4509, 7992,2673,6588,14553,29403,55188,97416,15849, 39663,90207,189351,371358,687258,1209951,95175, 240894,560115,1211031,2458998,4727565,8664813, 15227190,576963,1473147,3485187] |