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 | 13 |
| 3 | 30 |
| 4 | 74 |
| 5 | 287 |
| 6 | 841 |
| 7 | 2463 |
| 8 | 7953 |
| 9 | 24428 |
| 10 | 74660 |
| 11 | 233017 |
| 12 | 721069 |
| 13 | 2226921 |
| 14 | 6907921 |
| 15 | 21399342 |
| 16 | 66252970 |
| 17 | 205308499 |
| 18 | 636102161 |
| 19 | 1970540971 |
| 20 | 6105562057 |
| 21 | 18917255184 |
| 22 | 58610713832 |
| 23 | 181598709121 |
| 24 | 562663895105 |
| 25 | 1743342282089 |
| 26 | 5401567886229 |