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 | 23 |
| 2 | 275 |
| 3 | 2277 |
| 4 | 14673 |
| 5 | 78407 |
| 6 | 361514 |
| 7 | 1477750 |
| 8 | 5461235 |
| 9 | 18518565 |
| 10 | 58282576 |
| 11 | 171815888 |
| 12 | 477989151 |
| 13 | 1262643305 |
| 14 | 3183445871 |
| 15 | 7694405993 |
| 16 | 17895700206 |
| 17 | 40182143330 |
| 18 | 87349858045 |
| 19 | 184297593435 |
| 20 | 378236260170 |
| 21 | 756560791350 |
| 22 | 1477481301465 |
| 23 | 2821499709615 |
| 24 | 5276341352249 |