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 | 51 |
| 2 | 2600 |
| 3 | 132549 |
| 4 | 6757399 |
| 5 | 344494800 |
| 6 | 17562477401 |
| 7 | 895341852651 |
| 8 | 45644872007800 |
| 9 | 2326993130545149 |
| 10 | 118631004785794799 |
| 11 | 6047854250944989600 |
| 12 | 308321935793408674801 |
| 13 | 15718370871212897425251 |
| 14 | 801328592496064360013000 |