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 | 15 |
| 3 | 88 |
| 4 | 435 |
| 5 | 1957 |
| 6 | 8394 |
| 7 | 35273 |
| 8 | 146795 |
| 9 | 607492 |
| 10 | 2503687 |
| 11 | 10282873 |
| 12 | 42103670 |
| 13 | 171925709 |
| 14 | 700339023 |
| 15 | 2846710048 |
| 16 | 11549292123 |
| 17 | 46778169517 |
| 18 | 189188288130 |
| 19 | 764162167025 |
| 20 | 3083079787091 |
| 21 | 12426568931356 |
| 22 | 50042249662927 |
| 23 | 201366368701441 |
| 24 | 809732016511598 |
| 25 | 3254128933657397 |