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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 23 |
| 4 | 54 |
| 5 | 118 |
| 6 | 246 |
| 7 | 489 |
| 8 | 940 |
| 9 | 1751 |
| 10 | 3177 |
| 11 | 5630 |
| 12 | 9776 |
| 13 | 16659 |
| 14 | 27922 |
| 15 | 46092 |
| 16 | 75039 |
| 17 | 120615 |
| 18 | 191611 |
| 19 | 301086 |
| 20 | 468342 |
| 21 | 721638 |
| 22 | 1102113 |
| 23 | 1669226 |
| 24 | 2508429 |
| 25 | 3741741 |
| 26 | 5542532 |
| 27 | 8155720 |
| 28 | 11925654 |
| 29 | 17334077 |
| 30 | 25051940 |
| 31 | 36009468 |
| 32 | 51491111 |
| 33 | 73263043 |
| 34 | 103744575 |
[1,3,9,23,54,118,246,489,940,1751,3177,5630,9776, 16659,27922,46092,75039,120615,191611,301086, 468342,721638,1102113,1669226,2508429,3741741, 5542532,8155720,11925654,17334077,25051940, 36009468,51491111,73263043,103744575] |