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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 1 |
| 2 | 23 |
| 3 | 73 |
| 4 | 227 |
| 5 | 1669 |
| 6 | 3581 |
| 7 | 18097 |
| 8 | 19427 |
| 9 | 58537 |
| 10 | 176123 |
| 11 | 529393 |
| 12 | 2653109 |
| 13 | 36661237 |
| 14 | 33464399 |
| 15 | 43013953 |
| 16 | 597805589 |
[2,1,23,73,227,1669,3581,18097,19427,58537,176123, 529393,2653109,36661237,33464399,43013953, 597805589] |