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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 20 |
| 3 | 21 |
| 4 | 860 |
| 5 | 881 |
| 6 | 17599 |
| 7 | 18480 |
| 8 | 756799 |
| 9 | 775279 |
| 10 | 15487100 |
| 11 | 16262379 |
| 12 | 665982260 |
| 13 | 682244639 |
| 14 | 13628630401 |
| 15 | 14310875040 |
| 16 | 586063632001 |
| 17 | 600374507041 |
| 18 | 11993179265780 |
| 19 | 12593553772821 |
| 20 | 515735330178620 |
| 21 | 528328883951441 |
| 22 | 10553984125255999 |
| 23 | 11082313009207440 |
[1,1,20,21,860,881,17599,18480,756799,775279, 15487100,16262379,665982260,682244639,13628630401, 14310875040,586063632001,600374507041, 11993179265780,12593553772821,515735330178620, 528328883951441,10553984125255999, 11082313009207440] |