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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 15 |
| 3 | 2380 |
| 4 | 1056496 |
| 5 | 1006985994 |
| 6 | 1762986495425 |
| 7 | 5113595093793395 |
| 8 | 22839265373518360690 |
| 9 | 148735602883834110187329 |
| 10 | 1353820891564948063221216616 |
| 11 | 16652183007514287292261315076600 |
| 12 | 269267286009015985660399792630965620 |
| 13 | 5594310615550213586375706097295466365365 |
[1,0,15,2380,1056496,1006985994,1762986495425, 5113595093793395,22839265373518360690, 148735602883834110187329, 1353820891564948063221216616, 16652183007514287292261315076600, 269267286009015985660399792630965620, 5594310615550213586375706097295466365365] |