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 | 2 |
| 1 | 8 |
| 2 | 128 |
| 3 | 512 |
| 4 | 32768 |
| 5 | 131072 |
| 6 | 2097152 |
| 7 | 8388608 |
| 8 | 2147483648 |
| 9 | 8589934592 |
| 10 | 137438953472 |
| 11 | 549755813888 |
| 12 | 35184372088832 |
| 13 | 140737488355328 |
| 14 | 2251799813685248 |
| 15 | 9007199254740992 |
| 16 | 9223372036854775808 |
| 17 | 36893488147419103232 |
| 18 | 590295810358705651712 |
| 19 | 2361183241434822606848 |