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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 28 |
| 5 | 66 |
| 6 | 154 |
| 7 | 348 |
| 8 | 762 |
| 9 | 1645 |
| 10 | 3569 |
| 11 | 7849 |
| 12 | 17418 |
| 13 | 38588 |
| 14 | 84611 |
| 15 | 183135 |
| 16 | 392475 |
| 17 | 838029 |
| 18 | 1793945 |
| 19 | 3863537 |
| 20 | 8369150 |
| 21 | 18177363 |
| 22 | 39421917 |
| 23 | 85087021 |
| 24 | 182500928 |
| 25 | 389187036 |
| 26 | 826803475 |
| 27 | 1754407220 |
| 28 | 3726873592 |
| 29 | 7935854531 |
| 30 | 16936911839 |
| 31 | 36183082043 |