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| n | a(n) |
|---|---|
| 8 | 1 |
| 9 | 0 |
| 10 | 45 |
| 11 | 165 |
| 12 | 1980 |
| 13 | 14157 |
| 14 | 123123 |
| 15 | 1042470 |
| 16 | 11229075 |
| 17 | 117721175 |
| 18 | 1085614101 |
| 19 | 11354532696 |
| 20 | 132028149240 |
| 21 | 1440550986525 |
| 22 | 15693895739115 |
| 23 | 183700174158435 |
| 24 | 2200557929261230 |
| 25 | 26295830857171150 |
| 26 | 323510486572841425 |
| 27 | 4085513198322259275 |
| 28 | 52716487743732737925 |
[1,0,45,165,1980,14157,123123,1042470,11229075, 117721175,1085614101,11354532696,132028149240, 1440550986525,15693895739115,183700174158435, 2200557929261230,26295830857171150, 323510486572841425,4085513198322259275, 52716487743732737925] |