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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 52 |
| 3 | 364 |
| 4 | 4732 |
| 5 | 75712 |
| 6 | 1665664 |
| 7 | 56632576 |
| 8 | 2265303040 |
| 9 | 56632576000 |
| 10 | 2265303040000 |
| 11 | 56632576000000 |
| 12 | 2265303040000000 |
| 13 | 56632576000000000 |
| 14 | 2265303040000000000 |
| 15 | 56632576000000000000 |
| 16 | 2265303040000000000000 |
[13,52,364,4732,75712,1665664,56632576,2265303040, 56632576000,2265303040000,56632576000000, 2265303040000000,56632576000000000, 2265303040000000000,56632576000000000000, 2265303040000000000000] |