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 | 14 |
| 3 | 62 |
| 4 | 254 |
| 5 | 16382 |
| 6 | 262142 |
| 7 | 1048574 |
| 8 | 4294967294 |
| 9 | 4611686018427387902 |
| 10 | 1237940039285380274899124222 |
| 11 | 324518553658426726783156020576254 |
| 12 | 340282366920938463463374607431768211454 |