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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 209 |
| 4 | 7874 |
| 5 | 687194 |
| 6 | 138026428 |
| 7 | 63273019396 |
| 8 | 65547617642192 |
| 9 | 151904702763916944 |
| 10 | 780028188748068778464 |
| 11 | 8799101018162158392857376 |
| 12 | 216405047530763040469557821568 |
| 13 | 11527355297347542160143184818391680 |
| 14 | 1322291382391922104463259686181056293632 |
[1,2,13,209,7874,687194,138026428,63273019396, 65547617642192,151904702763916944, 780028188748068778464,8799101018162158392857376, 216405047530763040469557821568, 11527355297347542160143184818391680, 1322291382391922104463259686181056293632] |