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 | 8 |
| 5 | 16 |
| 6 | 32 |
| 7 | 64 |
| 8 | 128 |
| 9 | 256 |
| 10 | 512 |
| 11 | 8192 |
| 12 | 16384 |
| 13 | 32768 |
| 14 | 65536 |
| 15 | 262144 |
| 16 | 524288 |
| 17 | 16777216 |
| 18 | 33554432 |
| 19 | 134217728 |
| 20 | 268435456 |
| 21 | 2147483648 |
| 22 | 4294967296 |
| 23 | 8589934592 |
| 24 | 17179869184 |
| 25 | 34359738368 |
| 26 | 68719476736 |
| 27 | 137438953472 |
| 28 | 549755813888 |
| 29 | 562949953421312 |
| 30 | 2251799813685248 |
| 31 | 147573952589676412928 |