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 | 20 |
| 2 | 58 |
| 3 | 134 |
| 4 | 358 |
| 5 | 950 |
| 6 | 2596 |
| 7 | 7160 |
| 8 | 19966 |
| 9 | 56078 |
| 10 | 158488 |
| 11 | 450140 |
| 12 | 1283848 |
| 13 | 3674600 |
| 14 | 10549282 |
| 15 | 30365294 |
| 16 | 87605806 |
| 17 | 253263470 |
| 18 | 733498744 |
| 19 | 2127803180 |
| 20 | 6181574548 |
| 21 | 17982188708 |
| 22 | 52373316262 |
| 23 | 152706201170 |
| 24 | 445700295760 |