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 | 5 |
| 3 | 19 |
| 4 | 61 |
| 5 | 203 |
| 6 | 669 |
| 7 | 2279 |
| 8 | 7797 |
| 9 | 27213 |
| 10 | 96111 |
| 11 | 343965 |
| 12 | 1240617 |
| 13 | 4513763 |
| 14 | 16546859 |
| 15 | 61027965 |
| 16 | 226454967 |
| 17 | 844181631 |
| 18 | 3161518957 |
| 19 | 11886015725 |
| 20 | 44847272299 |
| 21 | 169747439789 |
| 22 | 644345294711 |
| 23 | 2452231140853 |
| 24 | 9354606971985 |