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 | 25 |
| 2 | 61 |
| 3 | 145 |
| 4 | 337 |
| 5 | 781 |
| 6 | 1829 |
| 7 | 4269 |
| 8 | 9957 |
| 9 | 23233 |
| 10 | 54225 |
| 11 | 126533 |
| 12 | 295265 |
| 13 | 689021 |
| 14 | 1607877 |
| 15 | 3752057 |
| 16 | 8755625 |
| 17 | 20431737 |
| 18 | 47678569 |
| 19 | 111260509 |
| 20 | 259632437 |
| 21 | 605866385 |
| 22 | 1413822053 |
| 23 | 3299230409 |
| 24 | 7698933081 |
| 25 | 17965877829 |
| 26 | 41924350093 |
| 27 | 97832744293 |