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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 17 |
| 6 | 37 |
| 7 | 82 |
| 8 | 185 |
| 9 | 423 |
| 10 | 978 |
| 11 | 2283 |
| 12 | 5373 |
| 13 | 12735 |
| 14 | 30372 |
| 15 | 72832 |
| 16 | 175502 |
| 17 | 424748 |
| 18 | 1032004 |
| 19 | 2516347 |
| 20 | 6155441 |
| 21 | 15101701 |
| 22 | 37150472 |
| 23 | 91618049 |
| 24 | 226460893 |
| 25 | 560954047 |
| 26 | 1392251012 |
| 27 | 3461824644 |
| 28 | 8622571758 |
| 29 | 21511212261 |
| 30 | 53745962199 |
| 31 | 134474581374 |
[1,1,2,4,8,17,37,82,185,423,978,2283,5373,12735, 30372,72832,175502,424748,1032004,2516347,6155441, 15101701,37150472,91618049,226460893,560954047, 1392251012,3461824644,8622571758,21511212261, 53745962199,134474581374] |