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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 23 |
| 3 | 261 |
| 4 | 3947 |
| 5 | 74613 |
| 6 | 1692563 |
| 7 | 44794221 |
| 8 | 1354849547 |
| 9 | 46101247173 |
| 10 | 1742977452803 |
| 11 | 72487571292381 |
| 12 | 3288697207653947 |
| 13 | 161639067567489333 |
| 14 | 8555659001848069043 |
| 15 | 485203383272476257741 |
| 16 | 29350999686572204663147 |
| 17 | 1886474390059466622333093 |
[1,3,23,261,3947,74613,1692563,44794221, 1354849547,46101247173,1742977452803, 72487571292381,3288697207653947, 161639067567489333,8555659001848069043, 485203383272476257741,29350999686572204663147, 1886474390059466622333093] |