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) |
|---|---|
| 1 | 1 |
| 2 | 96 |
| 3 | 9099 |
| 4 | 280832 |
| 5 | 4073375 |
| 6 | 36292320 |
| 7 | 230719293 |
| 8 | 1145393152 |
| 9 | 4707296613 |
| 10 | 16666924000 |
| 11 | 52307593239 |
| 12 | 148602435840 |
| 13 | 388302646355 |
| 14 | 944900450144 |
| 15 | 2162441849625 |
| 16 | 4691253854208 |
| 17 | 9710376716137 |
| 18 | 19280531603808 |
| 19 | 36888593841475 |
| 20 | 68266682784000 |
| 21 | 122597146773927 |