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 | 2 |
| 3 | 6 |
| 4 | 18 |
| 5 | 55 |
| 6 | 171 |
| 7 | 538 |
| 8 | 1708 |
| 9 | 5461 |
| 10 | 17560 |
| 11 | 56728 |
| 12 | 183973 |
| 13 | 598597 |
| 14 | 1953145 |
| 15 | 6388376 |
| 16 | 20939664 |
| 17 | 68764283 |
| 18 | 226192964 |
| 19 | 745146462 |
| 20 | 2458020664 |
| 21 | 8118111977 |
| 22 | 26841209903 |
| 23 | 88835163150 |
| 24 | 294284206183 |
| 25 | 975699571009 |
| 26 | 3237456793478 |
| 27 | 10749922312752 |
| 28 | 35718863630895 |
| 29 | 118757413662397 |