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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 19 |
| 4 | 75 |
| 5 | 303 |
| 6 | 1297 |
| 7 | 5557 |
| 8 | 24261 |
| 9 | 106399 |
| 10 | 472551 |
| 11 | 2107115 |
| 12 | 9466037 |
| 13 | 42670843 |
| 14 | 193357621 |
| 15 | 878695095 |
| 16 | 4008039183 |
| 17 | 18326746125 |
| 18 | 84037953711 |
| 19 | 386156408739 |
| 20 | 1778381839873 |
| 21 | 8204508712775 |
| 22 | 37920438844591 |
| 23 | 175530699463693 |
| 24 | 813755080675841 |
| 25 | 3777510322216653 |
| 26 | 17558169592824157 |
| 27 | 81705648375517987 |
[1,1,5,19,75,303,1297,5557,24261,106399,472551, 2107115,9466037,42670843,193357621,878695095, 4008039183,18326746125,84037953711,386156408739, 1778381839873,8204508712775,37920438844591, 175530699463693,813755080675841,3777510322216653, 17558169592824157,81705648375517987] |