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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 25 |
| 4 | 3617 |
| 5 | 340145 |
| 6 | 40490657 |
| 7 | 7034559753 |
| 8 | 1668333374913 |
| 9 | 504856533178465 |
| 10 | 189500285350524865 |
| 11 | 86696156445549770233 |
| 12 | 47524548345395009982689 |
| 13 | 30739504895562596416971025 |
| 14 | 23162222253680333719652996449 |
| 15 | 20112913566033287819336502367465 |
| 16 | 19939158697176271310635403636418945 |
[1,1,1,25,3617,340145,40490657,7034559753, 1668333374913,504856533178465,189500285350524865, 86696156445549770233,47524548345395009982689, 30739504895562596416971025, 23162222253680333719652996449, 20112913566033287819336502367465, 19939158697176271310635403636418945] |