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 | 12 |
| 3 | 279 |
| 4 | 11536 |
| 5 | 746525 |
| 6 | 69768036 |
| 7 | 8902181575 |
| 8 | 1487939919936 |
| 9 | 315597946293657 |
| 10 | 82839437215344100 |
| 11 | 26366747854082944451 |
| 12 | 10006618140321691249296 |
| 13 | 4464690010732922712332149 |
| 14 | 2313871692128866349730705924 |
| 15 | 1378552938661073773617331110975 |