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 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 49 |
| 5 | 175 |
| 6 | 637 |
| 7 | 2353 |
| 8 | 8788 |
| 9 | 33098 |
| 10 | 125476 |
| 11 | 478192 |
| 12 | 1830270 |
| 13 | 7030570 |
| 14 | 27088870 |
| 15 | 104647630 |
| 16 | 405187825 |
| 17 | 1571990935 |
| 18 | 6109558585 |
| 19 | 23782190485 |
| 20 | 92705454895 |
| 21 | 361834392115 |
| 22 | 1413883873975 |
| 23 | 5530599237775 |
| 24 | 21654401079325 |
| 25 | 84859704298201 |
| 26 | 332818970772253 |