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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 76 |
| 4 | 3394 |
| 5 | 546956 |
| 6 | 279754939 |
| 7 | 465819437152 |
| 8 | 2520182960610600 |
| 9 | 44155322347113863050 |
| 10 | 2500562115488233367551895 |
[1,5,76,3394,546956,279754939,465819437152, 2520182960610600,44155322347113863050, 2500562115488233367551895] |