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 | 1 |
| 1 | 4 |
| 2 | 8 |
| 3 | 32 |
| 4 | 128 |
| 5 | 512 |
| 6 | 1024 |
| 7 | 4096 |
| 8 | 32768 |
| 9 | 131072 |
| 10 | 262144 |
| 11 | 1048576 |
| 12 | 4194304 |
| 13 | 16777216 |
| 14 | 33554432 |
| 15 | 134217728 |
| 16 | 2147483648 |
| 17 | 8589934592 |
| 18 | 17179869184 |
| 19 | 68719476736 |
| 20 | 274877906944 |
| 21 | 1099511627776 |
| 22 | 2199023255552 |
| 23 | 8796093022208 |
| 24 | 70368744177664 |
| 25 | 281474976710656 |
| 26 | 562949953421312 |