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 | 15 |
| 2 | 224 |
| 3 | 3345 |
| 4 | 49951 |
| 5 | 745920 |
| 6 | 11138849 |
| 7 | 166336815 |
| 8 | 2483913376 |
| 9 | 37092363825 |
| 10 | 553901543999 |
| 11 | 8271430796160 |
| 12 | 123517560398401 |
| 13 | 1844491975179855 |
| 14 | 27543862067299424 |
| 15 | 411313439034311505 |