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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 6 |
| 4 | 39 |
| 5 | 318 |
| 6 | 3242 |
| 7 | 40348 |
| 8 | 598083 |
| 9 | 10337402 |
| 10 | 204706486 |
| 11 | 4577520108 |
| 12 | 114208773268 |
| 13 | 3147671423964 |
| 14 | 95023271024164 |
| 15 | 3119560618275648 |
| 16 | 110684959354534001 |
| 17 | 4221624141483353436 |
| 18 | 172274971776090819870 |
[1,6,39,318,3242,40348,598083,10337402,204706486, 4577520108,114208773268,3147671423964, 95023271024164,3119560618275648, 110684959354534001,4221624141483353436, 172274971776090819870] |