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 | 5 |
| 3 | 21 |
| 4 | 101 |
| 5 | 181 |
| 6 | 517 |
| 7 | 2133 |
| 8 | 5029 |
| 9 | 13301 |
| 10 | 47429 |
| 11 | 127893 |
| 12 | 340709 |
| 13 | 1099573 |
| 14 | 3145861 |
| 15 | 8597205 |
| 16 | 26190373 |
| 17 | 76524149 |
| 18 | 214079429 |
| 19 | 633125397 |
| 20 | 1857511781 |
| 21 | 5282782645 |
| 22 | 15412788997 |
| 23 | 45132977493 |
| 24 | 129657499813 |
| 25 | 376262123765 |