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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 225 |
| 5 | 21571 |
| 6 | 1174122 |
| 7 | 51441824 |
| 8 | 2038356243 |
| 9 | 76714338477 |
| 10 | 2804947403364 |
| 11 | 100732231517698 |
| 12 | 3572491367063421 |
| 13 | 125474030774355263 |
| 14 | 4371052010746528926 |
| 15 | 151172238539268318372 |
[0,0,0,0,225,21571,1174122,51441824,2038356243, 76714338477,2804947403364,100732231517698, 3572491367063421,125474030774355263, 4371052010746528926,151172238539268318372] |