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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 42 |
| 3 | 330 |
| 4 | 2850 |
| 5 | 26682 |
| 6 | 268098 |
| 7 | 2869242 |
| 8 | 32510850 |
| 9 | 388109562 |
| 10 | 4861622850 |
| 11 | 63682081530 |
| 12 | 869725707522 |
| 13 | 12352785293562 |
| 14 | 182049635623362 |
| 15 | 2778394592545530 |
| 16 | 43833623157604482 |
| 17 | 713738052924821754 |
[1,6,42,330,2850,26682,268098,2869242,32510850, 388109562,4861622850,63682081530,869725707522, 12352785293562,182049635623362,2778394592545530, 43833623157604482,713738052924821754] |