| n | a(n) |
|---|---|
| 4 | 8 |
| 5 | 78 |
| 6 | 1002 |
| 7 | 17018 |
| 8 | 323324 |
| 9 | 7436430 |
| 10 | 215656442 |
| 11 | 6685349672 |
| 12 | 247357937828 |
| 13 | 10141675450908 |
| 14 | 436092044389002 |
| 15 | 20496326086283048 |
| 16 | 1086305282573001492 |
| 17 | 64092011671807087970 |
| 18 | 3909612711980232366110 |
| 19 | 261944051702675568529304 |
[8,78,1002,17018,323324,7436430,215656442, 6685349672,247357937828,10141675450908, 436092044389002,20496326086283048, 1086305282573001492,64092011671807087970, 3909612711980232366110,261944051702675568529304] |