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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 12 |
| 3 | 78 |
| 4 | 203 |
| 5 | 484 |
| 6 | 1757 |
| 7 | 4979 |
| 8 | 19850 |
| 9 | 68830 |
| 10 | 207822 |
| 11 | 799573 |
| 12 | 2488921 |
| 13 | 8261626 |
| 14 | 29985170 |
| 15 | 94570580 |
| 16 | 336674607 |
| 17 | 1151293607 |
| 18 | 3775219224 |
| 19 | 13467393979 |
| 20 | 44587173533 |
| 21 | 151997573760 |
| 22 | 528796519331 |
| 23 | 1751682284364 |
| 24 | 6079087768020 |
[6,12,78,203,484,1757,4979,19850,68830,207822, 799573,2488921,8261626,29985170,94570580, 336674607,1151293607,3775219224,13467393979, 44587173533,151997573760,528796519331, 1751682284364,6079087768020] |