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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 294 |
| 5 | 5911 |
| 6 | 158293 |
| 7 | 5251690 |
| 8 | 206696194 |
| 9 | 9387611937 |
| 10 | 482745371458 |
| 11 | 27717788095397 |
| 12 | 1757818683339028 |
| 13 | 122058148921357056 |
| 14 | 9212494564360610855 |
| 15 | 751138761646263512978 |
| 16 | 65807775099574132000968 |
| 17 | 6166278653572358495161057 |
| 18 | 615421469545011786309942067 |
| 19 | 65183859793912213778457542207 |
| 20 | 7303117991652113167690085149033 |
[1,1,3,22,294,5911,158293,5251690,206696194, 9387611937,482745371458,27717788095397, 1757818683339028,122058148921357056, 9212494564360610855,751138761646263512978, 65807775099574132000968,6166278653572358495161057, 615421469545011786309942067, 65183859793912213778457542207, 7303117991652113167690085149033] |