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 | 14 |
| 4 | 43 |
| 5 | 140 |
| 6 | 472 |
| 7 | 1628 |
| 8 | 5719 |
| 9 | 20388 |
| 10 | 73562 |
| 11 | 268066 |
| 12 | 984911 |
| 13 | 3643570 |
| 14 | 13557020 |
| 15 | 50691978 |
| 16 | 190353370 |
| 17 | 717457656 |
| 18 | 2713061899 |
| 19 | 10289600164 |
| 20 | 39127877886 |
| 21 | 149147692734 |
| 22 | 569767908076 |
| 23 | 2180978471298 |
| 24 | 8363866011929 |
| 25 | 32129445138352 |
| 26 | 123618810558184 |