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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 162 |
| 3 | 2327 |
| 4 | 3256 |
| 5 | 21361 |
| 6 | 236326 |
| 7 | 1716995 |
| 8 | 8688851 |
| 9 | 56229035 |
| 10 | 428784791 |
| 11 | 3021617644 |
| 12 | 19058753004 |
| 13 | 128800589241 |
| 14 | 899664264951 |
| 15 | 6188584855591 |
| 16 | 41513163165807 |
| 17 | 282748964373121 |
| 18 | 1940464266658865 |
| 19 | 13278427810584311 |
[0,162,2327,3256,21361,236326,1716995,8688851, 56229035,428784791,3021617644,19058753004, 128800589241,899664264951,6188584855591, 41513163165807,282748964373121,1940464266658865, 13278427810584311] |