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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 75 |
| 4 | 2280 |
| 5 | 106852 |
| 6 | 6889527 |
| 7 | 569704489 |
| 8 | 57733506640 |
| 9 | 6944433285769 |
| 10 | 968356321790171 |
| 11 | 153738253618009045 |
| 12 | 27396489338187214000 |
| 13 | 5417302365503826145732 |
| 14 | 1177436831956414016252071 |
| 15 | 279074576444362385794783853 |
| 16 | 71649589941044468875380333533 |
[1,1,5,75,2280,106852,6889527,569704489, 57733506640,6944433285769,968356321790171, 153738253618009045,27396489338187214000, 5417302365503826145732,1177436831956414016252071, 279074576444362385794783853, 71649589941044468875380333533] |