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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 30 |
| 4 | 324 |
| 5 | 3130 |
| 6 | 53070 |
| 7 | 823550 |
| 8 | 17829896 |
| 9 | 387951939 |
| 10 | 10312525610 |
| 11 | 285311670622 |
| 12 | 9056807631948 |
| 13 | 302875106592266 |
| 14 | 11198819379685518 |
| 15 | 437901307945957140 |
| 16 | 18518802767263301648 |
| 17 | 827240261886336764194 |
| 18 | 39423330565860716459946 |
[1,6,30,324,3130,53070,823550,17829896,387951939, 10312525610,285311670622,9056807631948, 302875106592266,11198819379685518, 437901307945957140,18518802767263301648, 827240261886336764194,39423330565860716459946] |