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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 77 |
| 5 | 317 |
| 6 | 1417 |
| 7 | 6371 |
| 8 | 29019 |
| 9 | 134117 |
| 10 | 623759 |
| 11 | 2923269 |
| 12 | 13791533 |
| 13 | 65305615 |
| 14 | 310841939 |
| 15 | 1483967601 |
| 16 | 7107996949 |
| 17 | 34140691615 |
| 18 | 164350687661 |
| 19 | 792968518081 |
| 20 | 3832938906141 |
| 21 | 18559199721669 |
| 22 | 90004738169245 |
| 23 | 437085667023033 |
| 24 | 2125372248538213 |
| 25 | 10346780105421687 |
| 26 | 50424759540183311 |
| 27 | 245988413963497411 |
[1,1,5,17,77,317,1417,6371,29019,134117,623759, 2923269,13791533,65305615,310841939,1483967601, 7107996949,34140691615,164350687661,792968518081, 3832938906141,18559199721669,90004738169245, 437085667023033,2125372248538213, 10346780105421687,50424759540183311, 245988413963497411] |