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) |
|---|---|
| 21 | 1 |
| 22 | 3 |
| 23 | 9 |
| 24 | 22 |
| 25 | 51 |
| 26 | 108 |
| 27 | 221 |
| 28 | 414 |
| 29 | 765 |
| 30 | 1344 |
| 31 | 2310 |
| 32 | 3834 |
| 33 | 6248 |
| 34 | 9894 |
| 35 | 15408 |
| 36 | 23550 |
| 37 | 35394 |
| 38 | 52353 |
| 39 | 76402 |
| 40 | 109959 |
| 41 | 156366 |
| 42 | 219850 |
| 43 | 305796 |
| 44 | 421281 |
| 45 | 574568 |
| 46 | 777234 |
| 47 | 1042083 |
| 48 | 1387037 |
| 49 | 1831362 |
| 50 | 2402595 |
| 51 | 3128995 |
| 52 | 4051797 |
| 53 | 5211639 |
| 54 | 6668490 |
| 55 | 8482089 |
| 56 | 10737063 |
| 57 | 13516615 |