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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 3 |
| 9 | 74 |
| 10 | 0 |
| 11 | 0 |
| 12 | 15 |
| 13 | 10704 |
| 14 | 11158298 |
| 15 | 0 |
| 16 | 0 |
| 17 | 45 |
| 18 | 345640 |
| 19 | 4825452718593 |
| 20 | 314824408633217132928 |
| 21 | 0 |
| 22 | 0 |
| 23 | 105 |
| 24 | 5062600 |
| 25 | 48038354542204960 |
| 26 | 38491882659952177472606694634030116 |
| 27 | 136221825854745676076981182469325427379054390050209792 |
| 28 | 0 |
[0,0,0,0,0,0,0,3,74,0,0,15,10704,11158298,0,0,45, 345640,4825452718593,314824408633217132928,0,0, 105,5062600,48038354542204960, 38491882659952177472606694634030116, 13622182585474567607698118246932542737905439005020\ 9792,0] |