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 | 2 |
| 2 | 7 |
| 3 | 121 |
| 4 | 5461 |
| 5 | 12207031 |
| 6 | 2612138803 |
| 7 | 38771752331201 |
| 8 | 20587884010836553 |
| 9 | 1107867264956562636991 |
| 10 | 11111111111111111111111111111 |
| 11 | 19194342495775048050414684129181 |
| 12 | 773238409074645649506921062192257266781 |
| 13 | 391287702091575733090747617444785169589677401 |