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 | 1 |
| 2 | 4 |
| 3 | 13 |
| 4 | 41 |
| 5 | 129 |
| 6 | 406 |
| 7 | 1278 |
| 8 | 4023 |
| 9 | 12664 |
| 10 | 39865 |
| 11 | 125491 |
| 12 | 395033 |
| 13 | 1243524 |
| 14 | 3914488 |
| 15 | 12322413 |
| 16 | 38789712 |
| 17 | 122106097 |
| 18 | 384377665 |
| 19 | 1209982081 |
| 20 | 3808901426 |
| 21 | 11990037126 |
| 22 | 37743426307 |
| 23 | 118812495276 |
| 24 | 374009739309 |
| 25 | 1177344897715 |