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A007128 as a simple table
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 50 |
| 5 | 872 |
| 6 | 55056 |
| 7 | 14330784 |
| 8 | 14168055824 |
| 9 | 51063045165248 |
| 10 | 667216816957658368 |
| 11 | 31770676467810344050944 |
| 12 | 5550693121829253260986015232 |
| 13 | 3581419675678994222257101230830592 |
| 14 | 8583524017313906693161883558288460677120 |
[1,2,8,50,872,55056,14330784,14168055824, 51063045165248,667216816957658368, 31770676467810344050944, 5550693121829253260986015232, 3581419675678994222257101230830592, 8583524017313906693161883558288460677120] |