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 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 13 |
| 6 | 29 |
| 7 | 73 |
| 8 | 181 |
| 9 | 465 |
| 10 | 1205 |
| 11 | 3171 |
| 12 | 8425 |
| 13 | 22597 |
| 14 | 61073 |
| 15 | 166195 |
| 16 | 454949 |
| 17 | 1251985 |
| 18 | 3461573 |
| 19 | 9611191 |
| 20 | 26787377 |
| 21 | 74916661 |
| 22 | 210178457 |
| 23 | 591347989 |
| 24 | 1668172841 |
| 25 | 4717282753 |
| 26 | 13369522249 |
| 27 | 37970114703 |
| 28 | 108045430901 |