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 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 8 |
| 6 | 16 |
| 7 | 44 |
| 8 | 106 |
| 9 | 297 |
| 10 | 793 |
| 11 | 2259 |
| 12 | 6322 |
| 13 | 18212 |
| 14 | 52240 |
| 15 | 151818 |
| 16 | 440855 |
| 17 | 1288842 |
| 18 | 3767952 |
| 19 | 11058157 |
| 20 | 32452285 |
| 21 | 95467258 |