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 | -9 |
| 1 | -8 |
| 2 | -6 |
| 3 | -2 |
| 4 | 6 |
| 5 | 22 |
| 6 | 54 |
| 7 | 118 |
| 8 | 246 |
| 9 | 502 |
| 10 | 1014 |
| 11 | 2038 |
| 12 | 4086 |
| 13 | 8182 |
| 14 | 16374 |
| 15 | 32758 |
| 16 | 65526 |
| 17 | 131062 |
| 18 | 262134 |
| 19 | 524278 |
| 20 | 1048566 |
| 21 | 2097142 |
| 22 | 4194294 |
| 23 | 8388598 |
| 24 | 16777206 |
| 25 | 33554422 |
| 26 | 67108854 |
| 27 | 134217718 |
| 28 | 268435446 |
| 29 | 536870902 |
| 30 | 1073741814 |
| 31 | 2147483638 |