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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 491 |
| 5 | 12763 |
| 6 | 690756 |
| 7 | 70250881 |
| 8 | 13805853214 |
| 9 | 5567873958982 |
| 10 | 4386114219458332 |
| 11 | 6711687353310594027 |
| 12 | 21048327399504558833175 |
| 13 | 131214860796100022696745520 |
| 14 | 1603892616451767287785208156624 |
| 15 | 40296605442098101265893075903063822 |
| 16 | 2031406440758379976992019043333960734724 |
[1,1,5,37,491,12763,690756,70250881,13805853214, 5567873958982,4386114219458332, 6711687353310594027,21048327399504558833175, 131214860796100022696745520, 1603892616451767287785208156624, 40296605442098101265893075903063822, 2031406440758379976992019043333960734724] |