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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 145 |
| 4 | 2277 |
| 5 | 46461 |
| 6 | 1172713 |
| 7 | 35374697 |
| 8 | 1243296169 |
| 9 | 49940748073 |
| 10 | 2258238723021 |
| 11 | 113567169318285 |
| 12 | 6289161888870061 |
| 13 | 380364426242671469 |
| 14 | 24948313525570134001 |
| 15 | 1764095427822803465521 |
| 16 | 133782341347522663175889 |
| 17 | 10832097536377585282160337 |
| 18 | 932693691617428946786304661 |
[1,2,13,145,2277,46461,1172713,35374697, 1243296169,49940748073,2258238723021, 113567169318285,6289161888870061, 380364426242671469,24948313525570134001, 1764095427822803465521,133782341347522663175889, 10832097536377585282160337, 932693691617428946786304661] |