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 | 3 |
| 4 | 7 |
| 5 | 16 |
| 6 | 41 |
| 7 | 108 |
| 8 | 301 |
| 9 | 881 |
| 10 | 2684 |
| 11 | 8455 |
| 12 | 27444 |
| 13 | 91248 |
| 14 | 309593 |
| 15 | 1068584 |
| 16 | 3742171 |
| 17 | 13269281 |
| 18 | 47561455 |
| 19 | 172092274 |
| 20 | 627887239 |
| 21 | 2307902495 |
| 22 | 8539497952 |
| 23 | 31786480760 |
| 24 | 118960956585 |
| 25 | 447413177185 |
| 26 | 1690336204778 |
| 27 | 6412656031161 |