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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 589 |
| 3 | 9630 |
| 4 | 142621 |
| 5 | 1989510 |
| 6 | 26692669 |
| 7 | 348689550 |
| 8 | 4469016541 |
| 9 | 56480471190 |
| 10 | 706312706749 |
| 11 | 8761344810270 |
| 12 | 107992670570461 |
| 13 | 1324480424684070 |
| 14 | 16179464126208829 |
| 15 | 197010636086927790 |
[1,30,589,9630,142621,1989510,26692669,348689550, 4469016541,56480471190,706312706749,8761344810270, 107992670570461,1324480424684070, 16179464126208829,197010636086927790] |