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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 28 |
| 3 | 2763 |
| 4 | 113984 |
| 5 | 4069571 |
| 6 | 136572268 |
| 7 | 4331276717 |
| 8 | 132684847054 |
| 9 | 3961612505725 |
| 10 | 115959380822064 |
| 11 | 3341257551257359 |
| 12 | 95044914636370005 |
| 13 | 2674780297078876521 |
| 14 | 74591845346350588784 |
| 15 | 2063897837020442688904 |
[0,28,2763,113984,4069571,136572268,4331276717, 132684847054,3961612505725,115959380822064, 3341257551257359,95044914636370005, 2674780297078876521,74591845346350588784, 2063897837020442688904] |