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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 29 |
| 3 | 160 |
| 4 | 925 |
| 5 | 5363 |
| 6 | 31106 |
| 7 | 180397 |
| 8 | 1046223 |
| 9 | 6067629 |
| 10 | 35189573 |
| 11 | 204083997 |
| 12 | 1183597158 |
| 13 | 6864341406 |
| 14 | 39810152164 |
| 15 | 230881321531 |
| 16 | 1339009818730 |
| 17 | 7765666285883 |
| 18 | 45037438874738 |
| 19 | 261197278600938 |
| 20 | 1514828996788371 |
[4,29,160,925,5363,31106,180397,1046223,6067629, 35189573,204083997,1183597158,6864341406, 39810152164,230881321531,1339009818730, 7765666285883,45037438874738,261197278600938, 1514828996788371] |