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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 108 |
| 3 | 2184 |
| 4 | 47742 |
| 5 | 1090152 |
| 6 | 25611768 |
| 7 | 613822656 |
| 8 | 14929345764 |
| 9 | 367245444750 |
| 10 | 9115311075192 |
| 11 | 227905170276312 |
| 12 | 5732722676418360 |
| 13 | 144936257747302056 |
| 14 | 3680263321993685808 |
| 15 | 93801354359445152064 |
| 16 | 2398609984906822659918 |
[1,6,108,2184,47742,1090152,25611768,613822656, 14929345764,367245444750,9115311075192, 227905170276312,5732722676418360, 144936257747302056,3680263321993685808, 93801354359445152064,2398609984906822659918] |