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 | 1 |
| 2 | 513 |
| 3 | 21220 |
| 4 | 1130381 |
| 5 | 108174916 |
| 6 | 8543324917 |
| 7 | 800980035472 |
| 8 | 88064461381913 |
| 9 | 9832425683734288 |
| 10 | 1199454069536074601 |
| 11 | 158528649288125900224 |
| 12 | 21925314644323181005477 |
| 13 | 3213026006947537325856832 |
| 14 | 497390236613387084643144029 |
| 15 | 80481275337746709959509939456 |