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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 3 |
| 3 | 533 |
| 4 | 308 |
| 5 | 5289 |
| 6 | 1244791 |
| 7 | 126107189 |
| 8 | 76205040 |
| 9 | 54497877713 |
| 10 | 60414323151 |
| 11 | 114835995824 |
| 12 | 106293119818725 |
| 13 | 222582887719576 |
| 14 | 986513186619079 |
| 15 | 2757064804297737 |
| 16 | 18611596834765355 |
| 17 | 357849299891217865 |
| 18 | 4890470662334584620 |
[0,3,533,308,5289,1244791,126107189,76205040, 54497877713,60414323151,114835995824, 106293119818725,222582887719576,986513186619079, 2757064804297737,18611596834765355, 357849299891217865,4890470662334584620] |