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| n | a(n) |
|---|---|
| 1 | 81 |
| 2 | 245 |
| 3 | 781 |
| 4 | 2605 |
| 5 | 8901 |
| 6 | 31253 |
| 7 | 111685 |
| 8 | 406949 |
| 9 | 1503365 |
| 10 | 5632837 |
| 11 | 21327109 |
| 12 | 81569413 |
| 13 | 314366469 |
| 14 | 1220142341 |
| 15 | 4761187333 |
| 16 | 18668554757 |
| 17 | 73468028933 |
| 18 | 290057876485 |
| 19 | 1147984105477 |
| 20 | 4553121130501 |
| 21 | 18087737270277 |
| 22 | 71955008016389 |
[81,245,781,2605,8901,31253,111685,406949,1503365, 5632837,21327109,81569413,314366469,1220142341, 4761187333,18668554757,73468028933,290057876485, 1147984105477,4553121130501,18087737270277, 71955008016389] |