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 | 0 |
| 2 | 3 |
| 3 | 20 |
| 4 | 94 |
| 5 | 395 |
| 6 | 1492 |
| 7 | 4991 |
| 8 | 14848 |
| 9 | 39832 |
| 10 | 97835 |
| 11 | 223015 |
| 12 | 477126 |
| 13 | 966849 |
| 14 | 1869504 |
| 15 | 3470210 |
| 16 | 6214384 |
| 17 | 10780448 |
| 18 | 18178763 |
| 19 | 29884150 |
| 20 | 48010910 |
| 21 | 75541039 |
| 22 | 116618372 |
| 23 | 176923705 |
| 24 | 264148560 |
| 25 | 388588200 |
| 26 | 563877795 |
| 27 | 807899313 |
| 28 | 1143890790 |
| 29 | 1601794149 |