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 | 30 |
| 5 | 81 |
| 6 | 224 |
| 7 | 626 |
| 8 | 1747 |
| 9 | 4909 |
| 10 | 13811 |
| 11 | 38934 |
| 12 | 109889 |
| 13 | 310666 |
| 14 | 880125 |
| 15 | 2500221 |
| 16 | 7125406 |
| 17 | 20376598 |
| 18 | 58472481 |
| 19 | 168349612 |
| 20 | 486198698 |
| 21 | 1408140693 |
| 22 | 4088769215 |
| 23 | 11899761717 |
| 24 | 34703682407 |