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 | 10 |
| 5 | 26 |
| 6 | 103 |
| 7 | 371 |
| 8 | 1552 |
| 9 | 6475 |
| 10 | 28414 |
| 11 | 126530 |
| 12 | 577188 |
| 13 | 2670332 |
| 14 | 12538434 |
| 15 | 59554199 |
| 16 | 285882600 |
| 17 | 1384875627 |
| 18 | 6763821250 |
| 19 | 33276183371 |
| 20 | 164789380052 |
| 21 | 820923863918 |
| 22 | 4111708742153 |
| 23 | 20695831549310 |
| 24 | 104642143845428 |
| 25 | 531295928725508 |
| 26 | 2707906874407464 |