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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 17 |
| 6 | 36 |
| 7 | 72 |
| 8 | 155 |
| 9 | 319 |
| 10 | 677 |
| 11 | 1429 |
| 12 | 3094 |
| 13 | 6648 |
| 14 | 14518 |
| 15 | 31796 |
| 16 | 70491 |
| 17 | 156818 |
| 18 | 352371 |
| 19 | 795952 |
| 20 | 1813580 |
| 21 | 4155367 |
| 22 | 9594425 |
| 23 | 22283566 |
| 24 | 52122379 |
| 25 | 122631874 |
| 26 | 290432439 |
| 27 | 691831161 |
| 28 | 1658270316 |
| 29 | 3997272089 |
| 30 | 9692519896 |
| 31 | 23631827354 |
| 32 | 57943821449 |
| 33 | 142834652193 |
[1,1,2,4,9,17,36,72,155,319,677,1429,3094,6648, 14518,31796,70491,156818,352371,795952,1813580, 4155367,9594425,22283566,52122379,122631874, 290432439,691831161,1658270316,3997272089, 9692519896,23631827354,57943821449,142834652193] |