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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 25 |
| 3 | 1129 |
| 4 | 63251 |
| 5 | 1581371 |
| 6 | 52185743 |
| 7 | 33242372291 |
| 8 | 24176277773 |
| 9 | 40688677687159 |
| 10 | 2378722720177 |
| 11 | 3741730846458901 |
| 12 | 86059809503772983 |
| 13 | 72720539036773885963 |
| 14 | 72720539038037143387 |
| 15 | 52722390802769505531767 |
| 16 | 13075152919096992777263341 |
[0,1,25,1129,63251,1581371,52185743,33242372291, 24176277773,40688677687159,2378722720177, 3741730846458901,86059809503772983, 72720539036773885963,72720539038037143387, 52722390802769505531767, 13075152919096992777263341] |