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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 14 |
| 4 | 195 |
| 5 | 2200 |
| 6 | 24013 |
| 7 | 255969 |
| 8 | 2687317 |
| 9 | 27934809 |
| 10 | 288342379 |
| 11 | 2960920297 |
| 12 | 30285890402 |
| 13 | 308834717932 |
| 14 | 3141625339760 |
| 15 | 31895159990436 |
[0,1,14,195,2200,24013,255969,2687317,27934809, 288342379,2960920297,30285890402,308834717932, 3141625339760,31895159990436] |