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 | 2 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 4 |
| 5 | 11 |
| 6 | 47 |
| 7 | 521 |
| 8 | 24476 |
| 9 | 12752043 |
| 10 | 312119004989 |
| 11 | 3980154972736918051 |
| 12 | 1242282009792667284144565908482 |
| 13 | 4944474918817897417578506056549605984335718813571 |