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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 63 |
| 3 | 364 |
| 4 | 1326 |
| 5 | 3696 |
| 6 | 8645 |
| 7 | 17864 |
| 8 | 33660 |
| 9 | 59052 |
| 10 | 97867 |
| 11 | 154836 |
| 12 | 235690 |
| 13 | 347256 |
| 14 | 497553 |
| 15 | 695888 |
| 16 | 952952 |
| 17 | 1280916 |
| 18 | 1693527 |
| 19 | 2206204 |
| 20 | 2836134 |
| 21 | 3602368 |
| 22 | 4525917 |
| 23 | 5629848 |
| 24 | 6939380 |
| 25 | 8481980 |
| 26 | 10287459 |
| 27 | 12388068 |
| 28 | 14818594 |
| 29 | 17616456 |
| 30 | 20821801 |
| 31 | 24477600 |
| 32 | 28629744 |
[0,4,63,364,1326,3696,8645,17864,33660,59052, 97867,154836,235690,347256,497553,695888,952952, 1280916,1693527,2206204,2836134,3602368,4525917, 5629848,6939380,8481980,10287459,12388068, 14818594,17616456,20821801,24477600,28629744] |