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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 52 |
| 2 | 4140 |
| 3 | 678570 |
| 4 | 190899322 |
| 5 | 82864869804 |
| 6 | 51724158235372 |
| 7 | 44152005855084346 |
| 8 | 49631246523618756274 |
| 9 | 71339801938860275191172 |
| 10 | 128064670049908713818925644 |
| 11 | 281600203019560266563340426570 |
| 12 | 746289892095625330523099540639146 |
[2,52,4140,678570,190899322,82864869804, 51724158235372,44152005855084346, 49631246523618756274,71339801938860275191172, 128064670049908713818925644, 281600203019560266563340426570, 746289892095625330523099540639146] |