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 | 3 |
| 2 | 7 |
| 3 | 23 |
| 4 | 79 |
| 5 | 263 |
| 6 | 847 |
| 7 | 2663 |
| 8 | 8239 |
| 9 | 25223 |
| 10 | 76687 |
| 11 | 232103 |
| 12 | 700399 |
| 13 | 2109383 |
| 14 | 6344527 |
| 15 | 19066343 |
| 16 | 57264559 |
| 17 | 171924743 |
| 18 | 516036367 |
| 19 | 1548633383 |
| 20 | 4646948719 |
| 21 | 13942943303 |
| 22 | 41833024207 |
| 23 | 125507461223 |
| 24 | 376539160879 |
| 25 | 1129651037063 |
| 26 | 3389020220047 |
| 27 | 10167194877863 |