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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 43 |
| 5 | 1555 |
| 6 | 57283 |
| 7 | 12148963 |
| 8 | 2684744611 |
| 9 | 3403616850979 |
| 10 | 4512743621400355 |
| 11 | 34305128668265064739 |
| 12 | 272902655183139496957219 |
| 13 | 12446072589202949254455565603 |
| 14 | 594062125322746104949654522449187 |
| 15 | 162554939850629908283324416663519980835 |
[0,1,1,7,43,1555,57283,12148963,2684744611, 3403616850979,4512743621400355, 34305128668265064739,272902655183139496957219, 12446072589202949254455565603, 594062125322746104949654522449187, 162554939850629908283324416663519980835] |