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 | 7 |
| 2 | 49 |
| 3 | 240 |
| 4 | 1103 |
| 5 | 5357 |
| 6 | 26564 |
| 7 | 130828 |
| 8 | 641137 |
| 9 | 3143331 |
| 10 | 15426387 |
| 11 | 75714198 |
| 12 | 371548402 |
| 13 | 1823195326 |
| 14 | 8946675170 |
| 15 | 43903164079 |
| 16 | 215441286043 |
| 17 | 1057208843688 |
| 18 | 5187912250379 |
| 19 | 25458023997998 |
| 20 | 124927142385391 |
| 21 | 613040099740828 |