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 | 25 |
| 2 | 205 |
| 3 | 1345 |
| 4 | 10325 |
| 5 | 80475 |
| 6 | 642601 |
| 7 | 5201179 |
| 8 | 42555989 |
| 9 | 351057541 |
| 10 | 2915011415 |
| 11 | 24333734747 |
| 12 | 204025109321 |
| 13 | 1716939536441 |
| 14 | 14493675325957 |
| 15 | 122675396959965 |
| 16 | 1040712670097941 |
| 17 | 8846367126653991 |
| 18 | 75326437255237327 |