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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 6 |
| 3 | 2463 |
| 4 | 168710720 |
| 5 | 2463965471530395 |
| 6 | 14314557500958748403432016 |
| 7 | 50973867767312671230749731985210113185 |
| 8 | 155681492819036209829588907196662256860643565098656504 |
| 9 | 541851326514979120075051899545901289539707883395779770003009352752454758 |
[1,0,6,2463,168710720,2463965471530395, 14314557500958748403432016, 50973867767312671230749731985210113185, 15568149281903620982958890719666225686064356509865\ 6504, 54185132651497912007505189954590128953970788339577\ 9770003009352752454758] |