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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 56 |
| 3 | 626 |
| 4 | 7721 |
| 5 | 101322 |
| 6 | 1387648 |
| 7 | 19606874 |
| 8 | 283711805 |
| 9 | 4183074796 |
| 10 | 62618441024 |
| 11 | 949174260118 |
| 12 | 14539621490403 |
| 13 | 224721722650224 |
| 14 | 3500129695446816 |
| 15 | 54882906729334378 |
| 16 | 865664769346769005 |
| 17 | 13725517938819785298 |
| 18 | 218639429113140366968 |
[1,6,56,626,7721,101322,1387648,19606874, 283711805,4183074796,62618441024,949174260118, 14539621490403,224721722650224,3500129695446816, 54882906729334378,865664769346769005, 13725517938819785298,218639429113140366968] |