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) |
|---|---|
| 3 | 1 |
| 4 | 43 |
| 5 | 431 |
| 6 | 2482 |
| 7 | 10636 |
| 8 | 38138 |
| 9 | 122069 |
| 10 | 362853 |
| 11 | 1027843 |
| 12 | 2822668 |
| 13 | 7601784 |
| 14 | 20228876 |
| 15 | 53447609 |
| 16 | 140633575 |
| 17 | 369179479 |
| 18 | 967898846 |
| 19 | 2535852052 |
| 20 | 6641420806 |
| 21 | 17390705661 |
| 22 | 45533644161 |
| 23 | 119213967867 |
| 24 | 312112955384 |
| 25 | 817130734512 |
| 26 | 2139286435768 |
| 27 | 5600737350897 |