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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 861 |
| 3 | 28680 |
| 4 | 970921 |
| 5 | 32963140 |
| 6 | 1119662181 |
| 7 | 38034888528 |
| 8 | 1292062686481 |
| 9 | 43892073946540 |
| 10 | 1491038320325421 |
| 11 | 50651410052600280 |
| 12 | 1720656899012149561 |
| 13 | 58451683130389395028 |
| 14 | 1985636569382856677301 |
| 15 | 67453191675004485098400 |
| 16 | 2291422880375627492063521 |
| 17 | 77840924741066359629967420 |
[1,28,861,28680,970921,32963140,1119662181, 38034888528,1292062686481,43892073946540, 1491038320325421,50651410052600280, 1720656899012149561,58451683130389395028, 1985636569382856677301,67453191675004485098400, 2291422880375627492063521, 77840924741066359629967420] |