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 | 3 |
| 2 | 9 |
| 3 | 8 |
| 4 | 19 |
| 5 | 42 |
| 6 | 82 |
| 7 | 189 |
| 8 | 469 |
| 9 | 1029 |
| 10 | 2372 |
| 11 | 5661 |
| 12 | 12788 |
| 13 | 29440 |
| 14 | 69193 |
| 15 | 158299 |
| 16 | 364581 |
| 17 | 849888 |
| 18 | 1955567 |
| 19 | 4508226 |
| 20 | 10463966 |
| 21 | 24138613 |
| 22 | 55695301 |
| 23 | 128985441 |
| 24 | 297870624 |
| 25 | 687700145 |
| 26 | 1590857932 |
| 27 | 3675434388 |
| 28 | 8488858425 |
| 29 | 19626303139 |
| 30 | 45350971169 |