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 | 21 |
| 1 | 4 |
| 2 | 5 |
| 3 | 13 |
| 4 | 8 |
| 5 | 2 |
| 6 | 32 |
| 7 | 16 |
| 8 | 64 |
| 9 | 512 |
| 10 | 131072 |
| 11 | 4194304 |
| 12 | 8589934592 |
| 13 | 9007199254740992 |
| 14 | 75557863725914323419136 |
| 15 | 20769187434139310514121985316880384 |