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 | 1 |
| 2 | 258 |
| 3 | 6821 |
| 4 | 72872 |
| 5 | 470319 |
| 6 | 2229624 |
| 7 | 8464487 |
| 8 | 27530298 |
| 9 | 78974938 |
| 10 | 206418978 |
| 11 | 497450302 |
| 12 | 1126668140 |
| 13 | 2410089243 |
| 14 | 4930872330 |
| 15 | 9670306930 |
| 16 | 18336637198 |
| 17 | 33650085029 |
| 18 | 60146112858 |
| 19 | 104730757818 |
| 20 | 178524931538 |
| 21 | 297898015114 |
| 22 | 488407670832 |
| 23 | 786658901771 |