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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 34 |
| 3 | 186 |
| 4 | 1058 |
| 5 | 6026 |
| 6 | 34354 |
| 7 | 195866 |
| 8 | 1116738 |
| 9 | 6367146 |
| 10 | 36302674 |
| 11 | 206981946 |
| 12 | 1180120418 |
| 13 | 6728529866 |
| 14 | 38363130994 |
| 15 | 218729774426 |
| 16 | 1247101396098 |
| 17 | 7110426078186 |
| 18 | 40540535975314 |
| 19 | 231144384189306 |
| 20 | 1317884064847778 |
[1,6,34,186,1058,6026,34354,195866,1116738, 6367146,36302674,206981946,1180120418,6728529866, 38363130994,218729774426,1247101396098, 7110426078186,40540535975314,231144384189306, 1317884064847778] |