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) |
|---|---|
| 1 | 1 |
| 2 | 255 |
| 3 | 6562 |
| 4 | 65279 |
| 5 | 390626 |
| 6 | 1673310 |
| 7 | 5764802 |
| 8 | 16711423 |
| 9 | 43053283 |
| 10 | 99609630 |
| 11 | 214358882 |
| 12 | 428360798 |
| 13 | 815730722 |
| 14 | 1470024510 |
| 15 | 2563287812 |
| 16 | 4278124287 |
| 17 | 6975757442 |
| 18 | 10978587165 |
| 19 | 16983563042 |
| 20 | 25499674654 |
| 21 | 37828630724 |
| 22 | 54661514910 |
| 23 | 78310985282 |
| 24 | 109660357726 |
| 25 | 152588281251 |
| 26 | 208011334110 |
| 27 | 282472589764 |