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 | 5 |
| 2 | 13 |
| 3 | 61 |
| 4 | 181 |
| 5 | 421 |
| 6 | 5101 |
| 7 | 60901 |
| 8 | 135721 |
| 9 | 161881 |
| 10 | 163021 |
| 11 | 218461 |
| 12 | 595141 |
| 13 | 1108561 |
| 14 | 2574181 |
| 15 | 2740141 |
| 16 | 3248701 |
| 17 | 3535141 |
| 18 | 3723721 |
| 19 | 3729181 |
| 20 | 8197201 |
| 21 | 13933921 |
| 22 | 20218441 |
| 23 | 23605321 |
| 24 | 28569241 |
| 25 | 33874681 |
| 26 | 47248921 |
| 27 | 68667481 |
| 28 | 69372421 |