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) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 16 |
| 3 | 44 |
| 4 | 113 |
| 5 | 281 |
| 6 | 688 |
| 7 | 1672 |
| 8 | 4049 |
| 9 | 9789 |
| 10 | 23648 |
| 11 | 57108 |
| 12 | 137889 |
| 13 | 332913 |
| 14 | 803744 |
| 15 | 1940432 |
| 16 | 4684641 |
| 17 | 11309749 |
| 18 | 27304176 |
| 19 | 65918140 |
| 20 | 159140497 |
| 21 | 384199177 |
| 22 | 927538896 |
| 23 | 2239277016 |
| 24 | 5406092977 |
| 25 | 13051463021 |
| 26 | 31509019072 |
| 27 | 76069501220 |
| 28 | 183648021569 |
| 29 | 443365544417 |