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 | 4 |
| 1 | 64 |
| 2 | 1024 |
| 3 | 16384 |
| 4 | 262144 |
| 5 | 4194304 |
| 6 | 67108864 |
| 7 | 1073741824 |
| 8 | 17179869184 |
| 9 | 274877906944 |
| 10 | 4398046511104 |
| 11 | 70368744177664 |
| 12 | 1125899906842624 |
| 13 | 18014398509481984 |
| 14 | 288230376151711744 |
| 15 | 4611686018427387904 |
| 16 | 73786976294838206464 |
| 17 | 1180591620717411303424 |
| 18 | 18889465931478580854784 |