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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 43 |
| 5 | 193 |
| 6 | 1181 |
| 7 | 9547 |
| 8 | 99523 |
| 9 | 1292831 |
| 10 | 20374363 |
| 11 | 380964631 |
| 12 | 8300770763 |
| 13 | 207647281343 |
| 14 | 5890165284053 |
| 15 | 187490458428149 |
[0,2,5,13,43,193,1181,9547,99523,1292831,20374363, 380964631,8300770763,207647281343,5890165284053, 187490458428149] |