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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 10 |
| 6 | 26 |
| 7 | 73 |
| 8 | 211 |
| 9 | 630 |
| 10 | 1918 |
| 11 | 5944 |
| 12 | 18668 |
| 13 | 59311 |
| 14 | 190243 |
| 15 | 615269 |
| 16 | 2004025 |
| 17 | 6568174 |
| 18 | 21645438 |
| 19 | 71681152 |
| 20 | 238416580 |
| 21 | 796107464 |
| 22 | 2667768904 |
| 23 | 8968626418 |
| 24 | 30240087086 |
| 25 | 102238147891 |
| 26 | 346514952331 |
| 27 | 1177137322768 |
| 28 | 4007326361986 |
| 29 | 13669068510355 |
| 30 | 46711170248183 |
| 31 | 159899495303170 |