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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 29 |
| 5 | 211 |
| 6 | 926 |
| 7 | 3095 |
| 8 | 9829 |
| 9 | 37130 |
| 10 | 164921 |
| 11 | 728575 |
| 12 | 2973350 |
| 13 | 11450531 |
| 14 | 43942081 |
| 15 | 174174002 |
| 16 | 708653429 |
| 17 | 2884834891 |
| 18 | 11582386286 |
| 19 | 46006694735 |
| 20 | 182670807229 |
| 21 | 729520967450 |
| 22 | 2926800830801 |
| 23 | 11743814559415 |
| 24 | 47006639297270 |
| 25 | 187791199242011 |
| 26 | 750176293590361 |
[1,1,1,2,29,211,926,3095,9829,37130,164921,728575, 2973350,11450531,43942081,174174002,708653429, 2884834891,11582386286,46006694735,182670807229, 729520967450,2926800830801,11743814559415, 47006639297270,187791199242011,750176293590361] |