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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 14 |
| 5 | 30 |
| 6 | 76 |
| 7 | 188 |
| 8 | 444 |
| 9 | 1075 |
| 10 | 2656 |
| 11 | 6504 |
| 12 | 15926 |
| 13 | 39316 |
| 14 | 97252 |
| 15 | 240597 |
| 16 | 596686 |
| 17 | 1482971 |
| 18 | 3689768 |
| 19 | 9191590 |
| 20 | 22927718 |
| 21 | 57253334 |
| 22 | 143101896 |
| 23 | 358003469 |
| 24 | 896391914 |
| 25 | 2246149936 |
| 26 | 5632310800 |
| 27 | 14132640565 |
| 28 | 35483595966 |
| 29 | 89141668532 |
| 30 | 224061612932 |
| 31 | 563473301874 |