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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 5 |
| 5 | 95 |
| 6 | 336 |
| 7 | 2597 |
| 8 | 26832 |
| 9 | 197577 |
| 10 | 1847800 |
| 11 | 14621101 |
| 12 | 129754956 |
| 13 | 1146534701 |
| 14 | 12342194879 |
| 15 | 161225146370 |
| 16 | 2464561564936 |
| 17 | 39642413790129 |
| 18 | 620059254486798 |
| 19 | 9430493858327959 |
| 20 | 136438759335452360 |
| 21 | 1881721996407396801 |
| 22 | 24999081626667425376 |
| 23 | 321601467988647184779 |
[1,1,3,6,5,95,336,2597,26832,197577,1847800, 14621101,129754956,1146534701,12342194879, 161225146370,2464561564936,39642413790129, 620059254486798,9430493858327959, 136438759335452360,1881721996407396801, 24999081626667425376,321601467988647184779] |