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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 7 |
| 2 | 21 |
| 3 | 63 |
| 4 | 189 |
| 5 | 567 |
| 6 | 1699 |
| 7 | 5092 |
| 8 | 15260 |
| 9 | 45731 |
| 10 | 137046 |
| 11 | 410697 |
| 12 | 1230768 |
| 13 | 3688339 |
| 14 | 11053134 |
| 15 | 33123790 |
| 16 | 99264648 |
| 17 | 297474121 |
| 18 | 891463923 |
| 19 | 2671519536 |
| 20 | 8005951162 |
| 21 | 23992058879 |
| 22 | 71898875923 |
| 23 | 215464974683 |
| 24 | 645700711159 |
| 25 | 1935021731510 |
| 26 | 5798830691535 |
| 27 | 17377808652745 |
[2,7,21,63,189,567,1699,5092,15260,45731,137046, 410697,1230768,3688339,11053134,33123790,99264648, 297474121,891463923,2671519536,8005951162, 23992058879,71898875923,215464974683,645700711159, 1935021731510,5798830691535,17377808652745] |