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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 8 |
| 3 | 24 |
| 4 | 7280 |
| 5 | 13104 |
| 6 | 21840 |
| 7 | 32760 |
| 8 | 65520 |
| 9 | 2878785 |
| 10 | 5117840 |
| 11 | 6909084 |
| 12 | 8636355 |
| 13 | 19740240 |
| 14 | 27636336 |
| 15 | 46060560 |
| 16 | 69090840 |
| 17 | 138181680 |
| 18 | 1703601900 |
| 19 | 2271469200 |
| 20 | 3407203800 |
| 21 | 6814407600 |
| 22 | 20174525280 |
[3,8,24,7280,13104,21840,32760,65520,2878785, 5117840,6909084,8636355,19740240,27636336, 46060560,69090840,138181680,1703601900,2271469200, 3407203800,6814407600,20174525280] |