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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 7 |
| 3 | 127 |
| 4 | 32767 |
| 5 | 2147483647 |
| 6 | 9223372036854775807 |
| 7 | 170141183460469231731687303715884105727 |
| 8 | 57896044618658097711785492504343953926634992332820282019728792003956564819967 |