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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 28 |
| 4 | 430 |
| 5 | 9376 |
| 6 | 269675 |
| 7 | 9632960 |
| 8 | 411395268 |
| 9 | 20445999734 |
| 10 | 1159248404721 |
| 11 | 73846864163348 |
| 12 | 5221802726902476 |
| 13 | 405858598184643930 |
| 14 | 34392275731729465799 |
| 15 | 3155760058245300968416 |
| 16 | 311720334688779807141832 |
| 17 | 32980137195294216968253900 |
| 18 | 3720954854814866649904474180 |
[1,3,28,430,9376,269675,9632960,411395268, 20445999734,1159248404721,73846864163348, 5221802726902476,405858598184643930, 34392275731729465799,3155760058245300968416, 311720334688779807141832, 32980137195294216968253900, 3720954854814866649904474180] |