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 | 3 |
| 4 | 8 |
| 5 | 19 |
| 6 | 64 |
| 7 | 212 |
| 8 | 833 |
| 9 | 3360 |
| 10 | 14476 |
| 11 | 63848 |
| 12 | 289892 |
| 13 | 1338000 |
| 14 | 6275589 |
| 15 | 29791100 |
| 16 | 142973014 |
| 17 | 692507861 |
| 18 | 3382070233 |
| 19 | 16638445745 |
| 20 | 82395500651 |
| 21 | 410463736691 |
| 22 | 2055858519575 |
| 23 | 10347925039015 |
| 24 | 52321093290715 |
| 25 | 265648012207312 |
| 26 | 1353953547877556 |
| 27 | 6925400869302520 |