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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 15 |
| 4 | 69 |
| 5 | 273 |
| 6 | 1229 |
| 7 | 5319 |
| 8 | 24415 |
| 9 | 109221 |
| 10 | 511977 |
| 11 | 2334665 |
| 12 | 11081693 |
| 13 | 51334913 |
| 14 | 245326757 |
| 15 | 1150864887 |
| 16 | 5526605251 |
| 17 | 26166379639 |
| 18 | 126192482499 |
| 19 | 601515563957 |
| 20 | 2911677103881 |
| 21 | 13952444571557 |
| 22 | 67741416520845 |
| 23 | 326032539211253 |
| 24 | 1586799295785993 |
| 25 | 7665223068400129 |
| 26 | 37382668907072193 |
| 27 | 181139804804208745 |
[1,1,5,15,69,273,1229,5319,24415,109221,511977, 2334665,11081693,51334913,245326757,1150864887, 5526605251,26166379639,126192482499,601515563957, 2911677103881,13952444571557,67741416520845, 326032539211253,1586799295785993,7665223068400129, 37382668907072193,181139804804208745] |