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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 57 |
| 4 | 1292 |
| 5 | 7135 |
| 6 | 325560 |
| 7 | 4894715 |
| 8 | 125078632 |
| 9 | 1190664342 |
| 10 | 137798986920 |
| 11 | 1587893097945 |
| 12 | 258558380321076 |
| 13 | 3497709055775649 |
| 14 | 50821738502398864 |
| 15 | 1578753057237451095 |
| 16 | 443765620067972169968 |
| 17 | 7782162960545369351956 |
| 18 | 2741163034641146307693072 |
| 19 | 53564617257321061756508358 |
| 20 | 1100369599246721484969558920 |
[1,8,57,1292,7135,325560,4894715,125078632, 1190664342,137798986920,1587893097945, 258558380321076,3497709055775649, 50821738502398864,1578753057237451095, 443765620067972169968,7782162960545369351956, 2741163034641146307693072, 53564617257321061756508358, 1100369599246721484969558920] |