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| n | a(n) |
|---|---|
| 1 | 14 |
| 2 | 196 |
| 3 | 618 |
| 4 | 1711 |
| 5 | 7016 |
| 6 | 24512 |
| 7 | 106503 |
| 8 | 411848 |
| 9 | 1787438 |
| 10 | 7238503 |
| 11 | 31139116 |
| 12 | 128898716 |
| 13 | 550671103 |
| 14 | 2303973916 |
| 15 | 9799872866 |
| 16 | 41220045503 |
| 17 | 174880633792 |
| 18 | 737543803528 |
| 19 | 3124620453847 |
| 20 | 13195708252672 |
| 21 | 55859776281926 |
[14,196,618,1711,7016,24512,106503,411848,1787438, 7238503,31139116,128898716,550671103,2303973916, 9799872866,41220045503,174880633792,737543803528, 3124620453847,13195708252672,55859776281926] |