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 | 2 |
| 3 | 32 |
| 4 | 4 |
| 5 | 512 |
| 6 | 64 |
| 7 | 70368744177664 |
| 8 | 8 |
| 9 | 9007199254740992 |
| 10 | 1024 |
| 11 | 1125899906842624 |
| 12 | 128 |
| 13 | 131072 |
| 14 | 140737488355328 |
| 15 | 151115727451828646838272 |
| 16 | 16 |
| 17 | 17179869184 |
| 18 | 18014398509481984 |
| 19 | 19342813113834066795298816 |
| 20 | 2048 |
| 21 | 2147483648 |