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 | 3 |
| 2 | 10 |
| 3 | 73 |
| 4 | 241 |
| 5 | 2504 |
| 6 | 10537 |
| 7 | 124363 |
| 8 | 573928 |
| 9 | 7407840 |
| 10 | 35547994 |
| 11 | 491316166 |
| 12 | 2409600865 |
| 13 | 34896253009 |
| 14 | 174155363186 |
| 15 | 2601913448896 |
| 16 | 13163230391312 |
| 17 | 201431415980418 |
| 18 | 1029540512731472 |