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 | 19 |
| 3 | 65 |
| 4 | 295 |
| 5 | 1129 |
| 6 | 4663 |
| 7 | 18441 |
| 8 | 74359 |
| 9 | 296585 |
| 10 | 1188727 |
| 11 | 4751497 |
| 12 | 19015543 |
| 13 | 76048521 |
| 14 | 304232311 |
| 15 | 1216874633 |
| 16 | 4867651447 |
| 17 | 19470387337 |
| 18 | 77882161015 |
| 19 | 311527770249 |
| 20 | 1246113527671 |
| 21 | 4984450615433 |
| 22 | 19937812248439 |
| 23 | 79751235012745 |
| 24 | 319004979197815 |
| 25 | 1276019860867209 |