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 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 22 |
| 4 | 94 |
| 5 | 399 |
| 6 | 1691 |
| 7 | 7164 |
| 8 | 30348 |
| 9 | 128557 |
| 10 | 544577 |
| 11 | 2306866 |
| 12 | 9772042 |
| 13 | 41395035 |
| 14 | 175352183 |
| 15 | 742803768 |
| 16 | 3146567256 |
| 17 | 13329072793 |
| 18 | 56462858429 |
| 19 | 239180506510 |
| 20 | 1013184884470 |
| 21 | 4291920044391 |
| 22 | 18180865062035 |
| 23 | 77015380292532 |
| 24 | 326242386232164 |
| 25 | 1381984925221189 |
| 26 | 5854182087116921 |