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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 31 |
| 4 | 201 |
| 5 | 1206 |
| 6 | 6751 |
| 7 | 36051 |
| 8 | 187025 |
| 9 | 954136 |
| 10 | 4822527 |
| 11 | 24251877 |
| 12 | 121631329 |
| 13 | 609151986 |
| 14 | 3048441935 |
| 15 | 15249510871 |
| 16 | 76267672545 |
| 17 | 381394509228 |
| 18 | 1907131201327 |
| 19 | 9536109476745 |
| 20 | 47681856564305 |
| 21 | 238413094649734 |
| 22 | 1192076649237855 |
| 23 | 5960416195898811 |
[1,1,5,31,201,1206,6751,36051,187025,954136, 4822527,24251877,121631329,609151986,3048441935, 15249510871,76267672545,381394509228, 1907131201327,9536109476745,47681856564305, 238413094649734,1192076649237855,5960416195898811] |