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 | 1 |
| 2 | 253 |
| 3 | 49141 |
| 4 | 9533161 |
| 5 | 1849384153 |
| 6 | 358770992581 |
| 7 | 69599723176621 |
| 8 | 13501987525271953 |
| 9 | 2619315980179582321 |
| 10 | 508133798167313698381 |
| 11 | 98575337528478677903653 |
| 12 | 19123107346726696199610361 |