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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 7 |
| 3 | 70 |
| 4 | 877 |
| 5 | 13316 |
| 6 | 237799 |
| 7 | 4885980 |
| 8 | 113566121 |
| 9 | 2946476764 |
| 10 | 84417530491 |
| 11 | 2647176188372 |
| 12 | 90183424037293 |
| 13 | 3316840864313484 |
| 14 | 130985236211745959 |
| 15 | 5528094465439087876 |
| 16 | 248308899812296990033 |
| 17 | 11827417687501017074876 |
| 18 | 595470029978391175571923 |
[1,7,70,877,13316,237799,4885980,113566121, 2946476764,84417530491,2647176188372, 90183424037293,3316840864313484, 130985236211745959,5528094465439087876, 248308899812296990033,11827417687501017074876, 595470029978391175571923] |