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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 5 |
| 3 | 14 |
| 4 | 45 |
| 5 | 153 |
| 6 | 548 |
| 7 | 2019 |
| 8 | 7617 |
| 9 | 29412 |
| 10 | 115631 |
| 11 | 460957 |
| 12 | 1862485 |
| 13 | 7606505 |
| 14 | 31355446 |
| 15 | 130380787 |
| 16 | 546133589 |
| 17 | 2302845826 |
| 18 | 9770066898 |
| 19 | 41673128968 |
| 20 | 178635594272 |
| 21 | 769249036219 |
| 22 | 3326209843733 |
| 23 | 14437786734983 |
| 24 | 62891876474491 |
| 25 | 274855112709767 |
| 26 | 1204880110474124 |
| 27 | 5296884578875088 |
[1,2,5,14,45,153,548,2019,7617,29412,115631, 460957,1862485,7606505,31355446,130380787, 546133589,2302845826,9770066898,41673128968, 178635594272,769249036219,3326209843733, 14437786734983,62891876474491,274855112709767, 1204880110474124,5296884578875088] |