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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 61 |
| 3 | 499 |
| 4 | 1657 |
| 5 | 19627 |
| 6 | 270271 |
| 7 | 566414 |
| 8 | 10013422 |
| 9 | 98370749 |
| 10 | 101287949 |
| 11 | 2390592307 |
| 12 | 12232312607 |
| 13 | 37470326437 |
| 14 | 1107461467873 |
| 15 | 139734625012252 |
| 16 | 141993136103452 |
| 17 | 36029639090623 |
| 18 | 1351662817439371 |
| 19 | 1369250429650771 |
| 20 | 56824258828125611 |
| 21 | 2471493519758983073 |
[0,3,61,499,1657,19627,270271,566414,10013422, 98370749,101287949,2390592307,12232312607, 37470326437,1107461467873,139734625012252, 141993136103452,36029639090623,1351662817439371, 1369250429650771,56824258828125611, 2471493519758983073] |