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 | 4 |
| 2 | 29 |
| 3 | 258 |
| 4 | 2061 |
| 5 | 16723 |
| 6 | 136243 |
| 7 | 1107082 |
| 8 | 9001543 |
| 9 | 73188575 |
| 10 | 595039791 |
| 11 | 4837958263 |
| 12 | 39334611930 |
| 13 | 319806460796 |
| 14 | 2600161056897 |
| 15 | 21140392838611 |
| 16 | 171880201142842 |
| 17 | 1397457732946504 |
| 18 | 11361914049797193 |
| 19 | 92377098701406680 |