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| n | a(n) |
|---|---|
| 1 | 8 |
| 2 | 34 |
| 3 | 19 |
| 4 | 220 |
| 5 | 1637 |
| 6 | 4320 |
| 7 | 30072 |
| 8 | 206967 |
| 9 | 903664 |
| 10 | 5528305 |
| 11 | 33865076 |
| 12 | 178421588 |
| 13 | 1041376007 |
| 14 | 6119845720 |
| 15 | 34193886672 |
| 16 | 197233778418 |
| 17 | 1141888439215 |
| 18 | 6502450589845 |
| 19 | 37394525903413 |
| 20 | 215421948327015 |
| 21 | 1234270970196951 |
[8,34,19,220,1637,4320,30072,206967,903664, 5528305,33865076,178421588,1041376007,6119845720, 34193886672,197233778418,1141888439215, 6502450589845,37394525903413,215421948327015, 1234270970196951] |