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) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 11 |
| 6 | 23 |
| 7 | 48 |
| 8 | 114 |
| 9 | 293 |
| 10 | 869 |
| 11 | 2963 |
| 12 | 12066 |
| 13 | 58933 |
| 14 | 347498 |
| 15 | 2455693 |
| 16 | 20592932 |
| 17 | 202724920 |
| 18 | 2322206466 |
| 19 | 30743624324 |
| 20 | 468026657815 |
| 21 | 8161170076257 |