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 | 9 |
| 3 | 14 |
| 4 | 15 |
| 5 | 8 |
| 6 | -7 |
| 7 | -22 |
| 8 | -21 |
| 9 | 12 |
| 10 | 77 |
| 11 | 142 |
| 12 | 143 |
| 13 | 16 |
| 14 | -239 |
| 15 | -494 |
| 16 | -493 |
| 17 | 20 |
| 18 | 1045 |
| 19 | 2070 |
| 20 | 2071 |
| 21 | 24 |
| 22 | -4071 |
| 23 | -8166 |
| 24 | -8165 |
| 25 | 28 |
| 26 | 16413 |
| 27 | 32798 |
| 28 | 32799 |
| 29 | 32 |
| 30 | -65503 |
| 31 | -131038 |
| 32 | -131037 |
| 33 | 36 |
| 34 | 262181 |
| 35 | 524326 |
| 36 | 524327 |
| 37 | 40 |
| 38 | -1048535 |
| 39 | -2097110 |
| 40 | -2097109 |
| 41 | 44 |
| 42 | 4194349 |
| 43 | 8388654 |
| 44 | 8388655 |