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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 393 |
| 5 | 5481 |
| 6 | 95053 |
| 7 | 1975821 |
| 8 | 47939601 |
| 9 | 1330923601 |
| 10 | 41629292181 |
| 11 | 1448989481589 |
| 12 | 55561575788953 |
| 13 | 2327512861252281 |
| 14 | 105767732851318749 |
| 15 | 5182512561142513501 |
| 16 | 272391086209524010017 |
| 17 | 15287595381259195453089 |
| 18 | 912525533175190887597349 |
| 19 | 57726267762799335649572549 |
[1,1,5,37,393,5481,95053,1975821,47939601, 1330923601,41629292181,1448989481589, 55561575788953,2327512861252281, 105767732851318749,5182512561142513501, 272391086209524010017,15287595381259195453089, 912525533175190887597349, 57726267762799335649572549] |