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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 112 |
| 4 | 1648 |
| 5 | 22914 |
| 6 | 311988 |
| 7 | 4202440 |
| 8 | 56306491 |
| 9 | 752377824 |
| 10 | 10039480767 |
| 11 | 133868165460 |
| 12 | 1784368349249 |
| 13 | 23779898954002 |
| 14 | 316879002290160 |
| 15 | 4222360270783970 |
| 16 | 56260809604666184 |
| 17 | 749636868848349394 |
[0,7,112,1648,22914,311988,4202440,56306491, 752377824,10039480767,133868165460,1784368349249, 23779898954002,316879002290160,4222360270783970, 56260809604666184,749636868848349394] |