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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 8 |
| 4 | 94 |
| 5 | 1754 |
| 6 | 44638 |
| 7 | 1430912 |
| 8 | 55127738 |
| 9 | 2474943058 |
| 10 | 126686496842 |
| 11 | 7274993163208 |
| 12 | 462851928538166 |
| 13 | 32302608870561034 |
| 14 | 2452988579883365414 |
| 15 | 201318961408580839648 |
| 16 | 17755213859921917042610 |
| 17 | 1674529624268435698338210 |
| 18 | 168166630871054819006126610 |
| 19 | 17916303403273387932439315944 |
| 20 | 2018304444655346718894816153102 |
[1,2,2,8,94,1754,44638,1430912,55127738, 2474943058,126686496842,7274993163208, 462851928538166,32302608870561034, 2452988579883365414,201318961408580839648, 17755213859921917042610,1674529624268435698338210, 168166630871054819006126610, 17916303403273387932439315944, 2018304444655346718894816153102] |