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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 5 |
| 7 | 13 |
| 8 | 31 |
| 9 | 75 |
| 10 | 155 |
| 11 | 344 |
| 12 | 808 |
| 13 | 2019 |
| 14 | 5136 |
| 15 | 13422 |
| 16 | 34720 |
| 17 | 91055 |
| 18 | 238447 |
| 19 | 630753 |
| 20 | 1678780 |
| 21 | 4502862 |
| 22 | 12135507 |
| 23 | 32873145 |
| 24 | 89324119 |
| 25 | 243745113 |
| 26 | 667153916 |
| 27 | 1832553339 |
| 28 | 5048767393 |
| 29 | 13950607375 |
| 30 | 38649239592 |
| 31 | 107345311219 |
| 32 | 298820158401 |
| 33 | 833680894927 |
[1,1,1,1,1,2,5,13,31,75,155,344,808,2019,5136, 13422,34720,91055,238447,630753,1678780,4502862, 12135507,32873145,89324119,243745113,667153916, 1832553339,5048767393,13950607375,38649239592, 107345311219,298820158401,833680894927] |