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 | 2 |
| 2 | 4 |
| 3 | 16 |
| 4 | 32 |
| 5 | 128 |
| 6 | 256 |
| 7 | 2048 |
| 8 | 8192 |
| 9 | 16384 |
| 10 | 65536 |
| 11 | 131072 |
| 12 | 524288 |
| 13 | 4194304 |
| 14 | 8388608 |
| 15 | 33554432 |
| 16 | 67108864 |
| 17 | 268435456 |
| 18 | 536870912 |
| 19 | 2147483648 |
| 20 | 4294967296 |
| 21 | 17179869184 |
| 22 | 34359738368 |
| 23 | 137438953472 |
| 24 | 274877906944 |
| 25 | 2199023255552 |
| 26 | 8796093022208 |
| 27 | 17592186044416 |
| 28 | 70368744177664 |