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 | 7 |
| 2 | 15 |
| 3 | 37 |
| 4 | 89 |
| 5 | 215 |
| 6 | 519 |
| 7 | 1253 |
| 8 | 3025 |
| 9 | 7303 |
| 10 | 17631 |
| 11 | 42565 |
| 12 | 102761 |
| 13 | 248087 |
| 14 | 598935 |
| 15 | 1445957 |
| 16 | 3490849 |
| 17 | 8427655 |
| 18 | 20346159 |
| 19 | 49119973 |
| 20 | 118586105 |
| 21 | 286292183 |
| 22 | 691170471 |
| 23 | 1668633125 |
| 24 | 4028436721 |
| 25 | 9725506567 |