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 | 6 |
| 2 | 21 |
| 3 | 104 |
| 4 | 444 |
| 5 | 1614 |
| 6 | 5036 |
| 7 | 13934 |
| 8 | 34847 |
| 9 | 80258 |
| 10 | 172405 |
| 11 | 349182 |
| 12 | 672246 |
| 13 | 1238648 |
| 14 | 2196082 |
| 15 | 3763716 |
| 16 | 6258579 |
| 17 | 10130162 |
| 18 | 16003183 |
| 19 | 24731962 |
| 20 | 37466168 |
| 21 | 55732478 |
| 22 | 81531582 |
| 23 | 117456262 |
| 24 | 166829725 |
| 25 | 233871176 |
| 26 | 323887385 |
| 27 | 443498894 |
| 28 | 600898968 |