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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 25 |
| 3 | 313 |
| 4 | 3769 |
| 5 | 45241 |
| 6 | 542905 |
| 7 | 6514873 |
| 8 | 78178489 |
| 9 | 938141881 |
| 10 | 11257702585 |
| 11 | 135092431033 |
| 12 | 1621109172409 |
| 13 | 19453310068921 |
| 14 | 233439720827065 |
| 15 | 2801276649924793 |
| 16 | 33615319799097529 |
| 17 | 403383837589170361 |
| 18 | 4840606051070044345 |
| 19 | 58087272612840532153 |
[0,1,25,313,3769,45241,542905,6514873,78178489, 938141881,11257702585,135092431033,1621109172409, 19453310068921,233439720827065,2801276649924793, 33615319799097529,403383837589170361, 4840606051070044345,58087272612840532153] |