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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 44 |
| 5 | 152 |
| 6 | 569 |
| 7 | 2270 |
| 8 | 9524 |
| 9 | 41576 |
| 10 | 187348 |
| 11 | 866296 |
| 12 | 4092400 |
| 13 | 19684576 |
| 14 | 96156649 |
| 15 | 476038222 |
| 16 | 2384463044 |
| 17 | 12067926920 |
| 18 | 61641751124 |
| 19 | 317469893176 |
| 20 | 1647261806128 |
| 21 | 8605033903456 |
| 22 | 45228349510660 |
| 23 | 239061269168056 |
| 24 | 1270130468349904 |
| 25 | 6780349241182112 |
| 26 | 36355025167014224 |
| 27 | 195725149445320160 |
| 28 | 1057729059593103808 |
[1,2,5,14,44,152,569,2270,9524,41576,187348, 866296,4092400,19684576,96156649,476038222, 2384463044,12067926920,61641751124,317469893176, 1647261806128,8605033903456,45228349510660, 239061269168056,1270130468349904,6780349241182112, 36355025167014224,195725149445320160, 1057729059593103808] |