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 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 9 |
| 5 | 22 |
| 6 | 58 |
| 7 | 163 |
| 8 | 485 |
| 9 | 1519 |
| 10 | 4985 |
| 11 | 17077 |
| 12 | 60871 |
| 13 | 225152 |
| 14 | 862150 |
| 15 | 3410641 |
| 16 | 13913800 |
| 17 | 58440010 |
| 18 | 252348913 |
| 19 | 1118802690 |
| 20 | 5086910935 |
| 21 | 23693925911 |
| 22 | 112947299251 |
| 23 | 550527774738 |
| 24 | 2741489275969 |
| 25 | 13936841789100 |
| 26 | 72277551806634 |
| 27 | 382134348251357 |
| 28 | 2058420014680378 |