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 | 6 |
| 2 | 46 |
| 3 | 2206 |
| 4 | 4870846 |
| 5 | 23725150497406 |
| 6 | 562882766124611619513723646 |
| 7 | 316837008400094222150776738483768236006420971486980606 |