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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 21 |
| 3 | 48 |
| 4 | 108 |
| 5 | 236 |
| 6 | 506 |
| 7 | 1080 |
| 8 | 2294 |
| 9 | 4854 |
| 10 | 10248 |
| 11 | 21614 |
| 12 | 45564 |
| 13 | 96028 |
| 14 | 202354 |
| 15 | 426376 |
| 16 | 898374 |
| 17 | 1892838 |
| 18 | 3988096 |
| 19 | 8402638 |
| 20 | 17703724 |
| 21 | 37300364 |
| 22 | 78588906 |
| 23 | 165580536 |
| 24 | 348864886 |
| 25 | 735030230 |
| 26 | 1548649464 |
| 27 | 3262879566 |
| 28 | 6874624124 |
[6,21,48,108,236,506,1080,2294,4854,10248,21614, 45564,96028,202354,426376,898374,1892838,3988096, 8402638,17703724,37300364,78588906,165580536, 348864886,735030230,1548649464,3262879566, 6874624124] |