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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 27 |
| 5 | 106 |
| 6 | 316 |
| 7 | 835 |
| 8 | 2350 |
| 9 | 7232 |
| 10 | 21846 |
| 11 | 63985 |
| 12 | 186029 |
| 13 | 548387 |
| 14 | 1625398 |
| 15 | 4800819 |
| 16 | 14129048 |
| 17 | 41608725 |
| 18 | 122724222 |
| 19 | 362055916 |
| 20 | 1067475979 |
| 21 | 3146535362 |
| 22 | 9276448225 |
| 23 | 27352573231 |
| 24 | 80649512515 |
| 25 | 237779505381 |
| 26 | 701041117758 |
[1,3,13,27,106,316,835,2350,7232,21846,63985, 186029,548387,1625398,4800819,14129048,41608725, 122724222,362055916,1067475979,3146535362, 9276448225,27352573231,80649512515,237779505381, 701041117758] |