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 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 19 |
| 5 | 44 |
| 6 | 100 |
| 7 | 224 |
| 8 | 505 |
| 9 | 1142 |
| 10 | 2584 |
| 11 | 5840 |
| 12 | 13195 |
| 13 | 29816 |
| 14 | 67384 |
| 15 | 152288 |
| 16 | 344161 |
| 17 | 777770 |
| 18 | 1757692 |
| 19 | 3972248 |
| 20 | 8976979 |
| 21 | 20287268 |
| 22 | 45847612 |
| 23 | 103611968 |
| 24 | 234154873 |
| 25 | 529171550 |
| 26 | 1195885936 |
| 27 | 2702607776 |
| 28 | 6107680171 |
| 29 | 13802874992 |