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 | 13 |
| 1 | 39 |
| 2 | 117 |
| 3 | 351 |
| 4 | 1053 |
| 5 | 3159 |
| 6 | 9477 |
| 7 | 28431 |
| 8 | 85293 |
| 9 | 255879 |
| 10 | 767637 |
| 11 | 2302911 |
| 12 | 6908733 |
| 13 | 20726199 |
| 14 | 62178597 |
| 15 | 186535791 |
| 16 | 559607373 |
| 17 | 1678822119 |
| 18 | 5036466357 |
| 19 | 15109399071 |
| 20 | 45328197213 |
| 21 | 135984591639 |
| 22 | 407953774917 |
| 23 | 1223861324751 |
| 24 | 3671583974253 |
| 25 | 11014751922759 |