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 | 231 |
| 2 | 673 |
| 3 | 1961 |
| 4 | 5711 |
| 5 | 16621 |
| 6 | 48393 |
| 7 | 140893 |
| 8 | 410197 |
| 9 | 1194243 |
| 10 | 3476929 |
| 11 | 10122747 |
| 12 | 29471409 |
| 13 | 85803183 |
| 14 | 249807769 |
| 15 | 727291431 |
| 16 | 2117439451 |
| 17 | 6164722475 |
| 18 | 17947999987 |
| 19 | 52253885667 |
| 20 | 152132191293 |
| 21 | 442918327175 |
| 22 | 1289514355131 |
| 23 | 3754297734035 |