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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 4 |
| 3 | 398 |
| 4 | 10344 |
| 5 | 1808442 |
| 6 | 161718060 |
| 7 | 45246852870 |
| 8 | 8895239749200 |
| 9 | 3696108480038130 |
| 10 | 1280274899653919700 |
| 11 | 747254995555318476030 |
| 12 | 400947704397371982315960 |
| 13 | 314940075899759001168711210 |
[0,2,4,398,10344,1808442,161718060,45246852870, 8895239749200,3696108480038130, 1280274899653919700,747254995555318476030, 400947704397371982315960, 314940075899759001168711210] |