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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 0 |
| 2 | 4 |
| 3 | 9 |
| 4 | 8 |
| 5 | 30 |
| 6 | 43 |
| 7 | 84 |
| 8 | 176 |
| 9 | 297 |
| 10 | 604 |
| 11 | 1122 |
| 12 | 2099 |
| 13 | 4056 |
| 14 | 7564 |
| 15 | 14409 |
| 16 | 27296 |
| 17 | 51510 |
| 18 | 97819 |
| 19 | 184908 |
| 20 | 350168 |
| 21 | 663273 |
| 22 | 1255060 |
| 23 | 2377050 |
| 24 | 4499939 |
| 25 | 8519280 |
| 26 | 16131028 |
| 27 | 30538377 |
| 28 | 57819896 |
| 29 | 109469838 |
| 30 | 207254923 |
| 31 | 392399364 |
| 32 | 742919360 |
| 33 | 1406563497 |
| 34 | 2663036812 |
[3,0,4,9,8,30,43,84,176,297,604,1122,2099,4056, 7564,14409,27296,51510,97819,184908,350168,663273, 1255060,2377050,4499939,8519280,16131028,30538377, 57819896,109469838,207254923,392399364,742919360, 1406563497,2663036812] |