| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 474 |
| 3 | 6902 |
| 4 | 90867 |
| 5 | 1126545 |
| 6 | 13446028 |
| 7 | 156530604 |
| 8 | 1791797733 |
| 9 | 20274317063 |
| 10 | 227558149182 |
| 11 | 2539586737506 |
| 12 | 28227640438999 |
| 13 | 312844584806781 |
| 14 | 3460030004311536 |
| 15 | 38210322891344408 |
| 16 | 421513875961285065 |
[1,27,474,6902,90867,1126545,13446028,156530604, 1791797733,20274317063,227558149182,2539586737506, 28227640438999,312844584806781,3460030004311536, 38210322891344408,421513875961285065] |