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 | 2 |
| 3 | 4 |
| 4 | 16 |
| 5 | 128 |
| 6 | 65536 |
| 7 | 9007199254740992 |
| 8 | 73786976294838206464 |
| 9 | 205688069665150755269371147819668813122841983204197482918576128 |