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 | 5 |
| 2 | 49 |
| 3 | 357 |
| 4 | 2725 |
| 5 | 20793 |
| 6 | 158429 |
| 7 | 1207525 |
| 8 | 9203377 |
| 9 | 70144889 |
| 10 | 534620525 |
| 11 | 4074695269 |
| 12 | 31055936969 |
| 13 | 236697756661 |
| 14 | 1804029548133 |
| 15 | 13749697742817 |
| 16 | 104795505274517 |
| 17 | 798715588594961 |
| 18 | 6087537722095689 |
| 19 | 46397135660186377 |