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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 23 |
| 3 | 191 |
| 4 | 1727 |
| 5 | 17279 |
| 6 | 207359 |
| 7 | 2903039 |
| 8 | 43545599 |
| 9 | 696729599 |
| 10 | 12541132799 |
| 11 | 250822655999 |
| 12 | 5267275775999 |
| 13 | 115880067071999 |
| 14 | 2781121609727999 |
| 15 | 69528040243199999 |
| 16 | 1807729046323199999 |
| 17 | 48808684250726399999 |
| 18 | 1366643159020339199999 |
[0,3,23,191,1727,17279,207359,2903039,43545599, 696729599,12541132799,250822655999,5267275775999, 115880067071999,2781121609727999, 69528040243199999,1807729046323199999, 48808684250726399999,1366643159020339199999] |