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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 5 |
| 3 | 218 |
| 4 | 746 |
| 5 | 10906 |
| 6 | 72186 |
| 7 | 588090 |
| 8 | 3656900 |
| 9 | 26647829 |
| 10 | 180803752 |
| 11 | 1093944096 |
| 12 | 6533839983 |
| 13 | 43705331783 |
[0,5,218,746,10906,72186,588090,3656900,26647829, 180803752,1093944096,6533839983,43705331783] |