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 | 3 |
| 2 | 21 |
| 3 | 327 |
| 4 | 9129 |
| 5 | 396363 |
| 6 | 24615741 |
| 7 | 2068052367 |
| 8 | 225742096209 |
| 9 | 31048132997523 |
| 10 | 5252064083753061 |
| 11 | 1071525520294178007 |
| 12 | 259439870666594250489 |
| 13 | 73542221109962636293083 |
| 14 | 24125551094579137082039181 |
| 15 | 9068240688454120376775401247 |
| 16 | 3871645204706420218816959159969 |