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 | 8 |
| 4 | 64 |
| 5 | 512 |
| 6 | 2048 |
| 7 | 8192 |
| 8 | 16384 |
| 9 | 32768 |
| 10 | 131072 |
| 11 | 2097152 |
| 12 | 67108864 |
| 13 | 4294967296 |
| 14 | 8589934592 |
| 15 | 68719476736 |
| 16 | 137438953472 |
| 17 | 2199023255552 |
| 18 | 4398046511104 |
| 19 | 8796093022208 |
| 20 | 17592186044416 |
| 21 | 35184372088832 |
| 22 | 70368744177664 |