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 | 2 |
| 4 | 5 |
| 5 | 7 |
| 6 | 18 |
| 7 | 32 |
| 8 | 84 |
| 9 | 185 |
| 10 | 486 |
| 11 | 1192 |
| 12 | 3179 |
| 13 | 8261 |
| 14 | 22290 |
| 15 | 59788 |
| 16 | 163181 |
| 17 | 445699 |
| 18 | 1228686 |
| 19 | 3396224 |
| 20 | 9440759 |
| 21 | 26322371 |
| 22 | 73680058 |
| 23 | 206822134 |
| 24 | 582308320 |
| 25 | 1643573625 |
| 26 | 4650401810 |
| 27 | 13186590962 |
| 28 | 37469003353 |