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 | 3 |
| 3 | 5 |
| 4 | 23 |
| 5 | 61 |
| 6 | 143 |
| 7 | 215 |
| 8 | 995 |
| 9 | 2481 |
| 10 | 5785 |
| 11 | 12907 |
| 12 | 29279 |
| 13 | 64963 |
| 14 | 144289 |
| 15 | 158049 |
| 16 | 683311 |
| 17 | 1471123 |
| 18 | 3166531 |
| 19 | 6759177 |
| 20 | 14404547 |
| 21 | 30548713 |