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 | 5 |
| 4 | 14 |
| 5 | 46 |
| 6 | 170 |
| 7 | 691 |
| 8 | 3073 |
| 9 | 14809 |
| 10 | 76666 |
| 11 | 423886 |
| 12 | 2490514 |
| 13 | 15479614 |
| 14 | 101389508 |
| 15 | 697513653 |
| 16 | 5025406212 |
| 17 | 37819960947 |
| 18 | 296618360520 |
| 19 | 2419362514273 |
| 20 | 20484053318220 |
| 21 | 179723185666151 |
| 22 | 1631519158000420 |
| 23 | 15302546831928727 |
| 24 | 148099068509673563 |