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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 72 |
| 4 | 1915 |
| 5 | 25795 |
| 6 | 19162 |
| 7 | 20236 |
| 8 | 75259 |
| 9 | 1554957 |
| 10 | 1491432 |
| 11 | 17313036 |
| 12 | 16732368 |
| 13 | 24256243 |
| 14 | 36578268 |
| 15 | 44514226 |
| 16 | 75661104 |
| 17 | 292402908 |
| 18 | 5482272832 |
| 19 | 1178829937 |
| 20 | 5302997764 |
| 21 | 18154748952 |
| 22 | 28439854393 |
| 23 | 16773808684 |
| 24 | 47254132795 |
| 25 | 53265315697 |
| 26 | 74423911503 |
| 27 | 141806992844 |
[1,3,72,1915,25795,19162,20236,75259,1554957, 1491432,17313036,16732368,24256243,36578268, 44514226,75661104,292402908,5482272832,1178829937, 5302997764,18154748952,28439854393,16773808684, 47254132795,53265315697,74423911503,141806992844] |