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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 27 |
| 3 | 315 |
| 4 | 4158 |
| 5 | 59049 |
| 6 | 880308 |
| 7 | 13586859 |
| 8 | 215233605 |
| 9 | 3479417370 |
| 10 | 57168561996 |
| 11 | 951892141473 |
| 12 | 16026585711660 |
| 13 | 272383068872700 |
| 14 | 4666865660812044 |
| 15 | 80521573261807755 |
| 16 | 1397858693681272230 |
| 17 | 24398716826612190447 |
| 18 | 427921056863230599900 |
| 19 | 7537621933880388620010 |
[1,3,27,315,4158,59049,880308,13586859,215233605, 3479417370,57168561996,951892141473, 16026585711660,272383068872700,4666865660812044, 80521573261807755,1397858693681272230, 24398716826612190447,427921056863230599900, 7537621933880388620010] |