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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 158 |
| 5 | 741 |
| 6 | 4062 |
| 7 | 22193 |
| 8 | 223831 |
| 9 | 1335126 |
| 10 | 9060774 |
| 11 | 56864949 |
| 12 | 385073172 |
| 13 | 2564432294 |
| 14 | 16901547638 |
| 15 | 112676217841 |
| 16 | 937204012264 |
| 17 | 6501855139871 |
| 18 | 48016961289750 |
| 19 | 334280249251750 |
| 20 | 2491679096609658 |
| 21 | 17706521277052782 |
| 22 | 128014129417240852 |
| 23 | 907908731566219349 |
[1,1,5,17,158,741,4062,22193,223831,1335126, 9060774,56864949,385073172,2564432294,16901547638, 112676217841,937204012264,6501855139871, 48016961289750,334280249251750,2491679096609658, 17706521277052782,128014129417240852, 907908731566219349] |