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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 63 |
| 5 | 259 |
| 6 | 1067 |
| 7 | 4441 |
| 8 | 19171 |
| 9 | 82665 |
| 10 | 359847 |
| 11 | 1592493 |
| 12 | 7054023 |
| 13 | 31408477 |
| 14 | 141222211 |
| 15 | 635735405 |
| 16 | 2871906307 |
| 17 | 13053172561 |
| 18 | 59402203413 |
| 19 | 271013152957 |
| 20 | 1241586416665 |
| 21 | 5694526128321 |
| 22 | 26168463733923 |
| 23 | 120610935005569 |
| 24 | 556464506959781 |
| 25 | 2571287472113759 |
| 26 | 11907609696676003 |
| 27 | 55193902622249547 |
[1,1,5,17,63,259,1067,4441,19171,82665,359847, 1592493,7054023,31408477,141222211,635735405, 2871906307,13053172561,59402203413,271013152957, 1241586416665,5694526128321,26168463733923, 120610935005569,556464506959781,2571287472113759, 11907609696676003,55193902622249547] |