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 | 1 |
| 2 | 7 |
| 3 | 13 |
| 4 | 31 |
| 5 | 85 |
| 6 | 199 |
| 7 | 493 |
| 8 | 1231 |
| 9 | 3013 |
| 10 | 7447 |
| 11 | 18397 |
| 12 | 45343 |
| 13 | 111925 |
| 14 | 276199 |
| 15 | 681421 |
| 16 | 1681519 |
| 17 | 4149157 |
| 18 | 10237879 |
| 19 | 25262269 |
| 20 | 62334655 |
| 21 | 153810709 |
| 22 | 379529095 |
| 23 | 936489133 |
| 24 | 2310790159 |
| 25 | 5701884805 |
| 26 | 14069421655 |
| 27 | 34716351901 |
| 28 | 85662734431 |
| 29 | 211373124853 |
| 30 | 521564001319 |