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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 11 |
| 3 | 43 |
| 4 | 179 |
| 5 | 771 |
| 6 | 3411 |
| 7 | 15371 |
| 8 | 70283 |
| 9 | 324971 |
| 10 | 1516195 |
| 11 | 7125731 |
| 12 | 33691907 |
| 13 | 160107627 |
| 14 | 764108987 |
| 15 | 3660048235 |
| 16 | 17586950003 |
| 17 | 84740141795 |
| 18 | 409295012819 |
| 19 | 1981116681227 |
| 20 | 9607426955019 |
| 21 | 46670258489995 |
| 22 | 227056918475331 |
| 23 | 1106181623926499 |
| 24 | 5395847682861859 |
| 25 | 26350328313268011 |
| 26 | 128814007312154683 |
[1,3,11,43,179,771,3411,15371,70283,324971, 1516195,7125731,33691907,160107627,764108987, 3660048235,17586950003,84740141795,409295012819, 1981116681227,9607426955019,46670258489995, 227056918475331,1106181623926499,5395847682861859, 26350328313268011,128814007312154683] |