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 | 2 |
| 2 | 3 |
| 3 | 9 |
| 4 | 19 |
| 5 | 72 |
| 6 | 181 |
| 7 | 752 |
| 8 | 2051 |
| 9 | 8902 |
| 10 | 25417 |
| 11 | 113249 |
| 12 | 333101 |
| 13 | 1510888 |
| 14 | 4538219 |
| 15 | 20853973 |
| 16 | 63626003 |
| 17 | 295288350 |
| 18 | 911918665 |
| 19 | 4265460227 |
| 20 | 13300767273 |
| 21 | 62608960656 |
| 22 | 196778953279 |
| 23 | 931129725342 |
| 24 | 2945833819213 |
| 25 | 14000655099890 |
| 26 | 44541071348599 |
| 27 | 212484364171847 |