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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 511 |
| 3 | 9841 |
| 4 | 174251 |
| 5 | 488281 |
| 6 | 6017605 |
| 7 | 6725601 |
| 8 | 50955971 |
| 9 | 72636421 |
| 10 | 276964061 |
| 11 | 235794769 |
| 12 | 2234070293 |
| 13 | 883708281 |
| 14 | 3698977205 |
| 15 | 5148057541 |
| 16 | 13910980083 |
| 17 | 7411742281 |
| 18 | 46982039533 |
| 19 | 17927094321 |
| 20 | 99343345101 |
| 21 | 69493620405 |
[1,511,9841,174251,488281,6017605,6725601, 50955971,72636421,276964061,235794769,2234070293, 883708281,3698977205,5148057541,13910980083, 7411742281,46982039533,17927094321,99343345101, 69493620405] |