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 | 64 |
| 3 | 256 |
| 4 | 16384 |
| 5 | 65536 |
| 6 | 1048576 |
| 7 | 4194304 |
| 8 | 1073741824 |
| 9 | 4294967296 |
| 10 | 68719476736 |
| 11 | 274877906944 |
| 12 | 17592186044416 |
| 13 | 70368744177664 |
| 14 | 1125899906842624 |
| 15 | 4503599627370496 |
| 16 | 4611686018427387904 |
| 17 | 18446744073709551616 |
| 18 | 295147905179352825856 |
| 19 | 1180591620717411303424 |