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 | 0 |
| 2 | 2 |
| 3 | 7 |
| 4 | 23 |
| 5 | 73 |
| 6 | 227 |
| 7 | 697 |
| 8 | 2123 |
| 9 | 6433 |
| 10 | 19427 |
| 11 | 58537 |
| 12 | 176123 |
| 13 | 529393 |
| 14 | 1590227 |
| 15 | 4774777 |
| 16 | 14332523 |
| 17 | 43013953 |
| 18 | 129074627 |
| 19 | 387289417 |
| 20 | 1161999323 |
| 21 | 3486260113 |
| 22 | 10459304627 |
| 23 | 31378962457 |
| 24 | 94138984523 |
| 25 | 282421147873 |
| 26 | 847271832227 |