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 | 5 |
| 2 | 9 |
| 3 | 49 |
| 4 | 2209 |
| 5 | 4870849 |
| 6 | 23725150497409 |
| 7 | 562882766124611619513723649 |
| 8 | 316837008400094222150776738483768236006420971486980609 |