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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 41 |
| 4 | 165 |
| 5 | 687 |
| 6 | 2951 |
| 7 | 12861 |
| 8 | 56937 |
| 9 | 255227 |
| 10 | 1156995 |
| 11 | 5287185 |
| 12 | 24325901 |
| 13 | 112587815 |
| 14 | 523956543 |
| 15 | 2449799269 |
| 16 | 11500087377 |
| 17 | 54174459251 |
| 18 | 256027253243 |
| 19 | 1213527789561 |
| 20 | 5767023994869 |
| 21 | 27470856080927 |
| 22 | 131136432604919 |
| 23 | 627242243728269 |
| 24 | 3005666150390713 |
| 25 | 14426914113698667 |
| 26 | 69354696385966451 |
[1,3,11,41,165,687,2951,12861,56937,255227, 1156995,5287185,24325901,112587815,523956543, 2449799269,11500087377,54174459251,256027253243, 1213527789561,5767023994869,27470856080927, 131136432604919,627242243728269,3005666150390713, 14426914113698667,69354696385966451] |