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 | 6 |
| 2 | 36 |
| 3 | 102 |
| 4 | 288 |
| 5 | 896 |
| 6 | 2499 |
| 7 | 6634 |
| 8 | 17848 |
| 9 | 47192 |
| 10 | 122200 |
| 11 | 315315 |
| 12 | 809784 |
| 13 | 2063670 |
| 14 | 5238225 |
| 15 | 13261490 |
| 16 | 33465000 |
| 17 | 84237826 |
| 18 | 211676500 |
| 19 | 531027000 |
| 20 | 1330245423 |
| 21 | 3328592562 |
| 22 | 8320844952 |
| 23 | 20782671568 |
| 24 | 51871277456 |
| 25 | 129387019195 |
| 26 | 322571437760 |