This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 2097143 |
| 2 | 1801088519 |
| 3 | 21869999969 |
| 4 | 42618442943 |
| 5 | 78364164059 |
| 6 | 137231006639 |
| 7 | 194754273839 |
| 8 | 435817657169 |
| 9 | 678223072799 |
| 10 | 1174711139783 |
| 11 | 1727094849479 |
| 12 | 3938980639103 |
| 13 | 4398046511039 |
| 14 | 4902227890559 |
| 15 | 6722988818363 |
| 16 | 19203908986079 |