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 | 10 |
| 3 | 138 |
| 4 | 5314 |
| 5 | 575122 |
| 6 | 176041978 |
| 7 | 153143689594 |
| 8 | 380082566144530 |
| 9 | 2699632942815871042 |
| 10 | 55016905649245690586122 |
| 11 | 3223966155402204759824471786 |