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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 73 |
| 5 | 452 |
| 6 | 2653 |
| 7 | 15993 |
| 8 | 118024 |
| 9 | 920997 |
| 10 | 12184613 |
| 11 | 162877680 |
| 12 | 2507024025 |
| 13 | 36984184204 |
| 14 | 682363665419 |
[1,5,13,73,452,2653,15993,118024,920997,12184613, 162877680,2507024025,36984184204,682363665419] |