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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 318 |
| 3 | 32134 |
| 4 | 4083008 |
| 5 | 587267282 |
| 6 | 91403537276 |
| 7 | 15027205920330 |
| 8 | 2572042542065646 |
| 9 | 454018964549333284 |
| 10 | 82122490665668040962 |
| 11 | 15150820045467016057500 |
| 12 | 2841258381788564812646472 |
| 13 | 540201085284535788002286246 |
| 14 | 103917818379993516623446237348 |
[1,6,318,32134,4083008,587267282,91403537276, 15027205920330,2572042542065646, 454018964549333284,82122490665668040962, 15150820045467016057500,2841258381788564812646472, 540201085284535788002286246, 103917818379993516623446237348] |