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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 5 |
| 3 | 89 |
| 4 | 2481 |
| 5 | 93274 |
| 6 | 4450645 |
| 7 | 258297570 |
| 8 | 17689681345 |
| 9 | 1397903887808 |
| 10 | 125286890408901 |
| 11 | 12562851683433765 |
| 12 | 1393925069404093105 |
| 13 | 169595051215441936902 |
| 14 | 22454465186157134883285 |
[1,0,5,89,2481,93274,4450645,258297570, 17689681345,1397903887808,125286890408901, 12562851683433765,1393925069404093105, 169595051215441936902,22454465186157134883285] |