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 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 30 |
| 5 | 97 |
| 6 | 127 |
| 7 | 224 |
| 8 | 9087 |
| 9 | 9311 |
| 10 | 18398 |
| 11 | 64505 |
| 12 | 276418 |
| 13 | 893759 |
| 14 | 1170177 |
| 15 | 2063936 |
| 16 | 83727617 |
| 17 | 85791553 |
| 18 | 169519170 |
| 19 | 594349063 |
| 20 | 2546915422 |
| 21 | 8235095329 |
| 22 | 10782010751 |
| 23 | 19017106080 |
| 24 | 771466253951 |
| 25 | 790483360031 |
| 26 | 1561949613982 |
| 27 | 5476332201977 |
| 28 | 23467278421890 |