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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 25 |
| 3 | 153 |
| 4 | 1161 |
| 5 | 8529 |
| 6 | 62866 |
| 7 | 463269 |
| 8 | 3413985 |
| 9 | 25158651 |
| 10 | 185401644 |
| 11 | 1366280170 |
| 12 | 10068527242 |
| 13 | 74197988927 |
| 14 | 546787174384 |
| 15 | 4029438241977 |
| 16 | 29694135683202 |
| 17 | 218824967904159 |
| 18 | 1612586643003039 |
| 19 | 11883633326206072 |
| 20 | 87574048591105435 |
[1,25,153,1161,8529,62866,463269,3413985,25158651, 185401644,1366280170,10068527242,74197988927, 546787174384,4029438241977,29694135683202, 218824967904159,1612586643003039, 11883633326206072,87574048591105435] |