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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 61 |
| 4 | 1123 |
| 5 | 27671 |
| 6 | 853411 |
| 7 | 31603447 |
| 8 | 1365807689 |
| 9 | 67469763889 |
| 10 | 3749935785301 |
| 11 | 231591200859701 |
| 12 | 15733654527061483 |
| 13 | 1166102347943957815 |
| 14 | 93629607937879486019 |
| 15 | 8096167402408961507311 |
| 16 | 750088483178476669111441 |
| 17 | 74127049788588758257392161 |
| 18 | 7783440821906363883725443813 |
| 19 | 865349148215025766722403077229 |
| 20 | 101553078711812924877087765912371 |
[1,1,5,61,1123,27671,853411,31603447,1365807689, 67469763889,3749935785301,231591200859701, 15733654527061483,1166102347943957815, 93629607937879486019,8096167402408961507311, 750088483178476669111441, 74127049788588758257392161, 7783440821906363883725443813, 865349148215025766722403077229, 101553078711812924877087765912371] |