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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 25 |
| 4 | 257 |
| 5 | 4361 |
| 6 | 104425 |
| 7 | 3241316 |
| 8 | 123865313 |
| 9 | 5628753361 |
| 10 | 296671566941 |
| 11 | 17798975341467 |
| 12 | 1197924420178381 |
| 13 | 89394126594968755 |
| 14 | 7326377073291002147 |
| 15 | 654215578855903951141 |
| 16 | 63225054646397348577601 |
| 17 | 6575059243843086616460321 |
| 18 | 732138834180570978286488133 |
[1,2,5,25,257,4361,104425,3241316,123865313, 5628753361,296671566941,17798975341467, 1197924420178381,89394126594968755, 7326377073291002147,654215578855903951141, 63225054646397348577601,6575059243843086616460321, 732138834180570978286488133] |