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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 12 |
| 3 | 1240 |
| 4 | 1655004 |
| 5 | 32796849930 |
| 6 | 10743023668660275 |
| 7 | 62590747974586286694030 |
| 8 | 6826987264035710020018176749475 |
| 9 | 14471606032117455546329821353159274382372 |
| 10 | 613427607589897771307393494301176209875530879140211 |
[0,1,12,1240,1655004,32796849930, 10743023668660275,62590747974586286694030, 6826987264035710020018176749475, 14471606032117455546329821353159274382372, 61342760758989777130739349430117620987553087914021\ 1] |