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 | 7 |
| 3 | 24 |
| 4 | 83 |
| 5 | 293 |
| 6 | 1055 |
| 7 | 3860 |
| 8 | 14299 |
| 9 | 53481 |
| 10 | 201551 |
| 11 | 764217 |
| 12 | 2912167 |
| 13 | 11143499 |
| 14 | 42791039 |
| 15 | 164812364 |
| 16 | 636438059 |
| 17 | 2463251009 |
| 18 | 9552773999 |
| 19 | 37112526989 |
| 20 | 144410649239 |
| 21 | 562724141459 |
| 22 | 2195581527359 |
| 23 | 8576490341249 |
| 24 | 33537507830423 |
| 25 | 131272552839203 |
| 26 | 514285886020255 |