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) |
|---|---|
| 1 | 3 |
| 2 | 22 |
| 3 | 78 |
| 4 | 234 |
| 5 | 652 |
| 6 | 1714 |
| 7 | 4360 |
| 8 | 10820 |
| 9 | 26366 |
| 10 | 63346 |
| 11 | 150482 |
| 12 | 354196 |
| 13 | 827310 |
| 14 | 1919884 |
| 15 | 4430664 |
| 16 | 10175910 |
| 17 | 23272918 |
| 18 | 53029498 |
| 19 | 120435100 |
| 20 | 272714858 |
| 21 | 615904208 |
| 22 | 1387638220 |
| 23 | 3119557838 |
| 24 | 6999162874 |
| 25 | 15675003042 |
| 26 | 35046218020 |