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) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 7 |
| 3 | 19 |
| 4 | 25 |
| 5 | 77 |
| 6 | 103 |
| 7 | 307 |
| 8 | 409 |
| 9 | 1229 |
| 10 | 1639 |
| 11 | 4915 |
| 12 | 6553 |
| 13 | 19661 |
| 14 | 26215 |
| 15 | 78643 |
| 16 | 104857 |
| 17 | 314573 |
| 18 | 419431 |
| 19 | 1258291 |
| 20 | 1677721 |
| 21 | 5033165 |
| 22 | 6710887 |
| 23 | 20132659 |
| 24 | 26843545 |
| 25 | 80530637 |
| 26 | 107374183 |
| 27 | 322122547 |
| 28 | 429496729 |
| 29 | 1288490189 |
| 30 | 1717986919 |
| 31 | 5153960755 |