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 | 7 |
| 3 | 17 |
| 4 | 41 |
| 5 | 99 |
| 6 | 242 |
| 7 | 596 |
| 8 | 1477 |
| 9 | 3681 |
| 10 | 9215 |
| 11 | 23155 |
| 12 | 58368 |
| 13 | 147530 |
| 14 | 373768 |
| 15 | 948882 |
| 16 | 2413264 |
| 17 | 6147414 |
| 18 | 15682008 |
| 19 | 40056238 |
| 20 | 102434119 |
| 21 | 262228051 |
| 22 | 671945055 |
| 23 | 1723350315 |
| 24 | 4423518544 |
| 25 | 11362907022 |
| 26 | 29208834520 |
| 27 | 75131251334 |
| 28 | 193370093508 |