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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 26 |
| 3 | 99 |
| 4 | 282 |
| 5 | 695 |
| 6 | 1578 |
| 7 | 3411 |
| 8 | 7154 |
| 9 | 14727 |
| 10 | 29970 |
| 11 | 60563 |
| 12 | 121866 |
| 13 | 244599 |
| 14 | 490202 |
| 15 | 981555 |
| 16 | 1964418 |
| 17 | 3930311 |
| 18 | 7862274 |
| 19 | 15726387 |
| 20 | 31454810 |
| 21 | 62911863 |
| 22 | 125826186 |
| 23 | 251655059 |
| 24 | 503313042 |
| 25 | 1006629255 |
| 26 | 2013261938 |
| 27 | 4026527571 |
| 28 | 8053059114 |
| 29 | 16106122487 |
| 30 | 32212249530 |
[0,3,26,99,282,695,1578,3411,7154,14727,29970, 60563,121866,244599,490202,981555,1964418,3930311, 7862274,15726387,31454810,62911863,125826186, 251655059,503313042,1006629255,2013261938, 4026527571,8053059114,16106122487,32212249530] |