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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 21 |
| 4 | 109 |
| 5 | 573 |
| 6 | 3209 |
| 7 | 18425 |
| 8 | 108649 |
| 9 | 652425 |
| 10 | 3979805 |
| 11 | 24583853 |
| 12 | 153488501 |
| 13 | 966993893 |
| 14 | 6139832385 |
| 15 | 39249227569 |
| 16 | 252400089361 |
| 17 | 1631676380497 |
| 18 | 10597809743477 |
| 19 | 69123464993925 |
| 20 | 452567027633853 |
| 21 | 2973269053045197 |
| 22 | 19595030047168569 |
| 23 | 129509530910221737 |
[1,1,5,21,109,573,3209,18425,108649,652425, 3979805,24583853,153488501,966993893,6139832385, 39249227569,252400089361,1631676380497, 10597809743477,69123464993925,452567027633853, 2973269053045197,19595030047168569, 129509530910221737] |