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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 10 |
| 3 | 1542 |
| 4 | 77075 |
| 5 | 113939 |
| 6 | 1122772 |
| 7 | 2455891300 |
| 8 | 2830138178 |
| 9 | 136387767490 |
| 10 | 2111259099790 |
| 11 | 3456955336468 |
| 12 | 4653248164310 |
| 13 | 10393297007134 |
| 14 | 321249146279171 |
| 15 | 972926121017616 |
| 16 | 72780032758751764 |
[6,10,1542,77075,113939,1122772,2455891300, 2830138178,136387767490,2111259099790, 3456955336468,4653248164310,10393297007134, 321249146279171,972926121017616,72780032758751764] |