| n | a(n) |
|---|---|
| 0 | 21 |
| 1 | 114 |
| 2 | 154 |
| 3 | 348 |
| 4 | 748 |
| 5 | 1824 |
| 6 | 4402 |
| 7 | 11177 |
| 8 | 28334 |
| 9 | 73281 |
| 10 | 189501 |
| 11 | 493774 |
| 12 | 1286655 |
| 13 | 3362376 |
| 14 | 8787092 |
| 15 | 22988862 |
| 16 | 60144668 |
| 17 | 157418794 |
[21,114,154,348,748,1824,4402,11177,28334,73281, 189501,493774,1286655,3362376,8787092,22988862, 60144668,157418794] |