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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 14 |
| 6 | 39 |
| 7 | 109 |
| 8 | 313 |
| 9 | 900 |
| 10 | 2943 |
| 11 | 10403 |
| 12 | 36195 |
| 13 | 127474 |
| 14 | 447352 |
| 15 | 1711141 |
| 16 | 7234223 |
| 17 | 29672119 |
| 18 | 123515469 |
| 19 | 511672779 |
| 20 | 2123410053 |
| 21 | 9349845765 |
| 22 | 45883313142 |
| 23 | 216991244323 |
| 24 | 1041956760633 |
| 25 | 4977352149113 |
| 26 | 23819499579914 |