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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 27 |
| 2 | 405 |
| 3 | 25515 |
| 4 | 2066715 |
| 5 | 7577955 |
| 6 | 2659862205 |
| 7 | 71816279535 |
| 8 | 3662630256285 |
| 9 | 626309773824735 |
| 10 | 2415766270466835 |
| 11 | 166687872662211615 |
| 12 | 7500954269799522675 |
| 13 | 1822731887561284010025 |
| 14 | 52859224739277236290725 |
[1,27,405,25515,2066715,7577955,2659862205, 71816279535,3662630256285,626309773824735, 2415766270466835,166687872662211615, 7500954269799522675,1822731887561284010025, 52859224739277236290725] |