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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 20580 |
| 6 | 9106440 |
| 7 | 1058272828 |
| 8 | 56671435220 |
| 9 | 1819138009252 |
| 10 | 40526220292026 |
| 11 | 685404291322800 |
| 12 | 9333711208757096 |
| 13 | 106588763704012184 |
| 14 | 1051025434717631806 |
| 15 | 9144977489478933912 |
| 16 | 71381946761468630363 |
[0,0,0,0,0,20580,9106440,1058272828,56671435220, 1819138009252,40526220292026,685404291322800, 9333711208757096,106588763704012184, 1051025434717631806,9144977489478933912, 71381946761468630363] |