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 | 5 |
| 3 | 14 |
| 4 | 39 |
| 5 | 112 |
| 6 | 323 |
| 7 | 932 |
| 8 | 2693 |
| 9 | 7790 |
| 10 | 22565 |
| 11 | 65466 |
| 12 | 190243 |
| 13 | 553748 |
| 14 | 1614363 |
| 15 | 4713432 |
| 16 | 13780841 |
| 17 | 40343210 |
| 18 | 118243273 |
| 19 | 346937614 |
| 20 | 1018958151 |
| 21 | 2995407840 |
| 22 | 8812890391 |
| 23 | 25948662684 |
| 24 | 76457517949 |
| 25 | 225429675606 |
| 26 | 665069604713 |