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 | 5 |
| 3 | -13 |
| 4 | 34 |
| 5 | -89 |
| 6 | 233 |
| 7 | -610 |
| 8 | 1597 |
| 9 | -4181 |
| 10 | 10946 |
| 11 | -28657 |
| 12 | 75025 |
| 13 | -196418 |
| 14 | 514229 |
| 15 | -1346269 |
| 16 | 3524578 |
| 17 | -9227465 |
| 18 | 24157817 |
| 19 | -63245986 |
| 20 | 165580141 |
| 21 | -433494437 |
| 22 | 1134903170 |
| 23 | -2971215073 |
| 24 | 7778742049 |
| 25 | -20365011074 |
| 26 | 53316291173 |
| 27 | -139583862445 |
| 28 | 365435296162 |
| 29 | -956722026041 |