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 | 2 |
| 2 | 7 |
| 3 | 17 |
| 4 | 58 |
| 5 | 209 |
| 6 | 316 |
| 7 | 1580 |
| 8 | 3526 |
| 9 | 4508 |
| 10 | 22540 |
| 11 | 112700 |
| 12 | 209206 |
| 13 | 1046030 |
| 14 | 447181 |
| 15 | 11801843 |
| 16 | 30311401 |
| 17 | 108510284 |
| 18 | 155130931 |
| 19 | 775654655 |
| 20 | 391488874 |
| 21 | 1957444370 |
| 22 | 9787221850 |
| 23 | 48936109250 |
| 24 | 150537367423 |
| 25 | 470257300634 |
| 26 | 656709284284 |