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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 7 |
| 5 | 18 |
| 6 | 36 |
| 7 | 118 |
| 8 | 265 |
| 9 | 263212 |
| 10 | 2217881 |
| 11 | 152599933940 |
| 12 | 542101086242752217003726400434973829461152534 |
| 13 | 63340828764059520458379290673240751904836319648345 |
[1,1,2,5,7,18,36,118,265,263212,2217881, 152599933940, 542101086242752217003726400434973829461152534, 63340828764059520458379290673240751904836319648345\ ] |