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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 14 |
| 6 | 25 |
| 7 | 46 |
| 8 | 97 |
| 9 | 189 |
| 10 | 344 |
| 11 | 674 |
| 12 | 1383 |
| 13 | 2683 |
| 14 | 4950 |
| 15 | 9955 |
| 16 | 20175 |
| 17 | 39130 |
| 18 | 72905 |
| 19 | 148487 |
| 20 | 298925 |
| 21 | 580328 |
| 22 | 1089343 |
| 23 | 2233409 |
| 24 | 4478413 |
| 25 | 8705686 |
| 26 | 16438345 |
| 27 | 33822205 |
| 28 | 67650909 |
| 29 | 131688362 |
| 30 | 251448212 |
| 31 | 515037942 |
| 32 | 1028483089 |
[1,1,2,3,7,14,25,46,97,189,344,674,1383,2683,4950, 9955,20175,39130,72905,148487,298925,580328, 1089343,2233409,4478413,8705686,16438345,33822205, 67650909,131688362,251448212,515037942,1028483089] |