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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 69 |
| 5 | 293 |
| 6 | 1265 |
| 7 | 5491 |
| 8 | 24899 |
| 9 | 112365 |
| 10 | 512129 |
| 11 | 2375379 |
| 12 | 11021119 |
| 13 | 51362551 |
| 14 | 241955331 |
| 15 | 1140089861 |
| 16 | 5389039923 |
| 17 | 25643375625 |
| 18 | 122089489367 |
| 19 | 582545550925 |
| 20 | 2792190962759 |
| 21 | 13390874237149 |
| 22 | 64325964827093 |
| 23 | 309993813229519 |
| 24 | 1494740037908429 |
| 25 | 7216598973065037 |
| 26 | 34923885056860867 |
| 27 | 169100310595959259 |
[1,1,5,17,69,293,1265,5491,24899,112365,512129, 2375379,11021119,51362551,241955331,1140089861, 5389039923,25643375625,122089489367,582545550925, 2792190962759,13390874237149,64325964827093, 309993813229519,1494740037908429,7216598973065037, 34923885056860867,169100310595959259] |