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 | 2 |
| 2 | 4 |
| 3 | 7 |
| 4 | 10 |
| 5 | 11 |
| 6 | 8 |
| 7 | 1 |
| 8 | -6 |
| 9 | -5 |
| 10 | 16 |
| 11 | 89 |
| 12 | -348 |
| 13 | -7747 |
| 14 | -58764 |
| 15 | -301959 |
| 16 | -1226902 |
| 17 | -4249557 |
| 18 | -13125130 |
| 19 | -36998357 |
| 20 | -95306260 |
| 21 | -219609123 |
| 22 | -430081728 |
| 23 | -623477651 |
| 24 | -457458788 |
| 25 | -3070156979 |
| 26 | -61496380490 |
| 27 | -630601717145 |
| 28 | -4635893019708 |
| 29 | -27904927526379 |