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 | 1 |
| 2 | 16 |
| 3 | 128 |
| 4 | 1024 |
| 5 | 16384 |
| 6 | 131072 |
| 7 | 1048576 |
| 8 | 16777216 |
| 9 | 134217728 |
| 10 | 1073741824 |
| 11 | 17179869184 |
| 12 | 137438953472 |
| 13 | 1099511627776 |
| 14 | 17592186044416 |
| 15 | 140737488355328 |
| 16 | 1125899906842624 |
| 17 | 18014398509481984 |
| 18 | 144115188075855872 |
| 19 | 1152921504606846976 |
| 20 | 18446744073709551616 |