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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 5 |
| 4 | 35 |
| 5 | 137 |
| 6 | 844 |
| 7 | 3237 |
| 8 | 19289 |
| 9 | 74075 |
| 10 | 435901 |
| 11 | 1681705 |
| 12 | 9840202 |
| 13 | 38142908 |
| 14 | 222555244 |
| 15 | 866299556 |
| 16 | 5047109045 |
| 17 | 19716828587 |
| 18 | 114778868635 |
| 19 | 449771556357 |
| 20 | 2617170238263 |
| 21 | 10282678191109 |
| 22 | 59821340594252 |
| 23 | 235568344161873 |
[1,5,35,137,844,3237,19289,74075,435901,1681705, 9840202,38142908,222555244,866299556,5047109045, 19716828587,114778868635,449771556357, 2617170238263,10282678191109,59821340594252, 235568344161873] |