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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 10 |
| 3 | 33 |
| 4 | 115 |
| 5 | 386 |
| 6 | 1323 |
| 7 | 4485 |
| 8 | 15290 |
| 9 | 51977 |
| 10 | 176947 |
| 11 | 601946 |
| 12 | 2048483 |
| 13 | 6969893 |
| 14 | 23717058 |
| 15 | 80700241 |
| 16 | 274599219 |
| 17 | 934369138 |
| 18 | 3179364635 |
| 19 | 10818345477 |
| 20 | 36811374474 |
| 21 | 125257251353 |
| 22 | 426210254579 |
| 23 | 1450256511946 |
| 24 | 4934757299411 |
[3,10,33,115,386,1323,4485,15290,51977,176947, 601946,2048483,6969893,23717058,80700241, 274599219,934369138,3179364635,10818345477, 36811374474,125257251353,426210254579, 1450256511946,4934757299411] |