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 | 8 |
| 3 | 183 |
| 4 | 8320 |
| 5 | 628805 |
| 6 | 71172096 |
| 7 | 11266376947 |
| 8 | 2376282177536 |
| 9 | 644092653605769 |
| 10 | 218152097885716480 |
| 11 | 90283850458537906511 |
| 12 | 44828889635978905387008 |
| 13 | 26302150870235970074916493 |
| 14 | 18001952557737056033350615040 |
| 15 | 14215240470695667525160827723915 |