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 | 7 |
| 5 | 24 |
| 6 | 86 |
| 7 | 313 |
| 8 | 1157 |
| 9 | 4325 |
| 10 | 16303 |
| 11 | 61856 |
| 12 | 235917 |
| 13 | 903620 |
| 14 | 3473381 |
| 15 | 13391280 |
| 16 | 51761781 |
| 17 | 200523644 |
| 18 | 778342906 |
| 19 | 3026400508 |
| 20 | 11785538461 |
| 21 | 45959004812 |
| 22 | 179444813270 |
| 23 | 701422450293 |
| 24 | 2744562302533 |
| 25 | 10749124666643 |
| 26 | 42135320616531 |