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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 5 |
| 7 | 128 |
| 8 | 2124 |
| 9 | 29445 |
| 10 | 373379 |
| 11 | 4517921 |
| 12 | 53342405 |
| 13 | 622358262 |
| 14 | 7229196009 |
| 15 | 83984283157 |
| 16 | 978558652802 |
| 17 | 11455522117193 |
| 18 | 134879815196252 |
| 19 | 1598299236441571 |
| 20 | 19067702481168369 |
[0,0,0,0,0,5,128,2124,29445,373379,4517921, 53342405,622358262,7229196009,83984283157, 978558652802,11455522117193,134879815196252, 1598299236441571,19067702481168369] |