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| n | a(n) |
|---|---|
| 4 | 0 |
| 5 | 19 |
| 6 | 197 |
| 7 | 10481 |
| 8 | 64027 |
| 9 | 1980327 |
| 10 | 259179061 |
| 11 | 1257208799 |
| 12 | 131286703021 |
| 13 | 2756321451033 |
| 14 | 12473384091267 |
| 15 | 250290955437775 |
| 16 | 21588599628845597 |
| 17 | 1792050990708087027 |
| 18 | 7763319803561678613 |
| 19 | 620323392829436218475 |
| 20 | 11365013042482773469559 |
| 21 | 48487140450183407727097 |
[0,19,197,10481,64027,1980327,259179061, 1257208799,131286703021,2756321451033, 12473384091267,250290955437775,21588599628845597, 1792050990708087027,7763319803561678613, 620323392829436218475,11365013042482773469559, 48487140450183407727097] |