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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 7 |
| 6 | 14 |
| 7 | 30 |
| 8 | 63 |
| 9 | 135 |
| 10 | 297 |
| 11 | 658 |
| 12 | 1470 |
| 13 | 3319 |
| 14 | 7547 |
| 15 | 17263 |
| 16 | 39722 |
| 17 | 91863 |
| 18 | 213379 |
| 19 | 497645 |
| 20 | 1164859 |
| 21 | 2735602 |
| 22 | 6443750 |
| 23 | 15220275 |
| 24 | 36041685 |
| 25 | 85546359 |
| 26 | 203486990 |
| 27 | 485000849 |
| 28 | 1158133257 |
| 29 | 2770323361 |
| 30 | 6637570675 |
| 31 | 15927592520 |
| 32 | 38274809136 |
| 33 | 92100301893 |
[1,1,1,2,4,7,14,30,63,135,297,658,1470,3319,7547, 17263,39722,91863,213379,497645,1164859,2735602, 6443750,15220275,36041685,85546359,203486990, 485000849,1158133257,2770323361,6637570675, 15927592520,38274809136,92100301893] |