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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 1027 |
| 4 | 468481 |
| 5 | 2890927 |
| 6 | 37009999 |
| 7 | 228383233 |
| 8 | 2126334691 |
| 9 | 104180336299 |
| 10 | 8230246567621 |
| 11 | 34238014256797 |
| 12 | 76626723259567 |
| 13 | 131147819778859 |
| 14 | 219609509027857 |
| 15 | 472852182249889 |
| 16 | 1033753383066391 |
| 17 | 2704803126286963 |
| 18 | 10360677762529861 |
| 19 | 16436880348770011 |
| 20 | 17349151213200703 |
| 21 | 81666517262244889 |
| 22 | 686779630199762359 |
[1,13,1027,468481,2890927,37009999,228383233, 2126334691,104180336299,8230246567621, 34238014256797,76626723259567,131147819778859, 219609509027857,472852182249889,1033753383066391, 2704803126286963,10360677762529861, 16436880348770011,17349151213200703, 81666517262244889,686779630199762359] |