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 | 3 |
| 3 | 7 |
| 4 | 23 |
| 5 | 75 |
| 6 | 296 |
| 7 | 1222 |
| 8 | 5699 |
| 9 | 28160 |
| 10 | 151857 |
| 11 | 867356 |
| 12 | 5302073 |
| 13 | 34176364 |
| 14 | 232932946 |
| 15 | 1665341260 |
| 16 | 12487204067 |
| 17 | 97743060158 |
| 18 | 797730561155 |
| 19 | 6768022876452 |
| 20 | 59606300409007 |
| 21 | 543773719267894 |
| 22 | 5131560749880622 |
| 23 | 50012790651415626 |
| 24 | 502782861641973256 |
| 25 | 5206962982060933623 |