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 | 7 |
| 1 | 13 |
| 2 | 55 |
| 3 | 349 |
| 4 | 2407 |
| 5 | 16813 |
| 6 | 117655 |
| 7 | 823549 |
| 8 | 5764807 |
| 9 | 40353613 |
| 10 | 282475255 |
| 11 | 1977326749 |
| 12 | 13841287207 |
| 13 | 96889010413 |
| 14 | 678223072855 |
| 15 | 4747561509949 |
| 16 | 33232930569607 |
| 17 | 232630513987213 |
| 18 | 1628413597910455 |
| 19 | 11398895185373149 |
| 20 | 79792266297612007 |
| 21 | 558545864083284013 |