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 | 7 |
| 2 | 13 |
| 3 | 181 |
| 4 | 349 |
| 5 | 673 |
| 6 | 1297 |
| 7 | 34513 |
| 8 | 90799453 |
| 9 | 175021573 |
| 10 | 4657290577 |
| 11 | 17304140641 |
| 12 | 1131469145856472270556751793 |
| 13 | 1544310310927991136025089626209 |
| 14 | 1442398599584422734286432395814518441223501 |
| 15 | 18598135820391234761502881488353916158281807617671450769 |