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 | 11 |
| 2 | 31 |
| 3 | 71 |
| 4 | 187 |
| 5 | 491 |
| 6 | 1327 |
| 7 | 3623 |
| 8 | 10003 |
| 9 | 27827 |
| 10 | 77911 |
| 11 | 219263 |
| 12 | 619747 |
| 13 | 1758131 |
| 14 | 5003239 |
| 15 | 14276831 |
| 16 | 40836163 |
| 17 | 117049091 |
| 18 | 336123463 |
| 19 | 966831503 |
| 20 | 2785160227 |
| 21 | 8034032147 |
| 22 | 23203096519 |
| 23 | 67087148063 |
| 24 | 194165268355 |
| 25 | 562477731491 |