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 | 3 |
| 2 | 9 |
| 3 | 28 |
| 4 | 87 |
| 5 | 273 |
| 6 | 857 |
| 7 | 2692 |
| 8 | 8457 |
| 9 | 26568 |
| 10 | 83465 |
| 11 | 262212 |
| 12 | 823762 |
| 13 | 2587924 |
| 14 | 8130202 |
| 15 | 25541782 |
| 16 | 80241874 |
| 17 | 252087281 |
| 18 | 791955549 |
| 19 | 2488001734 |
| 20 | 7816287969 |
| 21 | 24555592861 |
| 22 | 77143670136 |
| 23 | 242353987370 |
| 24 | 761377506289 |
| 25 | 2391937980365 |