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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 29 |
| 6 | 151 |
| 7 | 1069 |
| 8 | 9887 |
| 9 | 115891 |
| 10 | 1666421 |
| 11 | 28700933 |
| 12 | 580669933 |
| 13 | 13578126713 |
| 14 | 362075579539 |
| 15 | 10886955278951 |
| 16 | 365589325548857 |
| 17 | 13598064388599629 |
| 18 | 556220494250764093 |
[1,1,3,7,29,151,1069,9887,115891,1666421,28700933, 580669933,13578126713,362075579539,10886955278951, 365589325548857,13598064388599629, 556220494250764093] |