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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 67 |
| 2 | 2211 |
| 3 | 47905 |
| 4 | 766480 |
| 5 | 9657648 |
| 6 | 99795696 |
| 7 | 869648208 |
| 8 | 6522361560 |
| 9 | 42757703560 |
| 10 | 247994680648 |
| 11 | 1285063345176 |
| 12 | 5996962277488 |
| 13 | 25371763481680 |
| 14 | 97862516286480 |
| 15 | 345780890878896 |
| 16 | 1123787895356412 |
| 17 | 3371363686069236 |
| 18 | 9364899127970100 |
| 19 | 24151581961607100 |
[1,67,2211,47905,766480,9657648,99795696, 869648208,6522361560,42757703560,247994680648, 1285063345176,5996962277488,25371763481680, 97862516286480,345780890878896,1123787895356412, 3371363686069236,9364899127970100, 24151581961607100] |