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 | 8 |
| 2 | 45 |
| 3 | 205 |
| 4 | 831 |
| 5 | 3133 |
| 6 | 11294 |
| 7 | 39585 |
| 8 | 136302 |
| 9 | 464026 |
| 10 | 1568151 |
| 11 | 5273999 |
| 12 | 17681042 |
| 13 | 59149925 |
| 14 | 197598856 |
| 15 | 659479754 |
| 16 | 2199585548 |
| 17 | 7333198205 |
| 18 | 24441067317 |
| 19 | 81444567492 |
| 20 | 271360676916 |
| 21 | 904051477063 |
| 22 | 3011711782025 |
| 23 | 10032660556567 |
| 24 | 33420042561972 |