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 | 1 |
| 4 | 7 |
| 5 | 1 |
| 6 | -12 |
| 7 | -7 |
| 8 | 18 |
| 9 | 20 |
| 10 | -23 |
| 11 | -45 |
| 12 | 21 |
| 13 | 88 |
| 14 | 1 |
| 15 | -154 |
| 16 | -68 |
| 17 | 241 |
| 18 | 223 |
| 19 | -327 |
| 20 | -532 |
| 21 | 345 |
| 22 | 1082 |
| 23 | -140 |
| 24 | -1959 |
| 25 | -597 |
| 26 | 3181 |
| 27 | 2416 |
| 28 | -4543 |
| 29 | -6194 |
| 30 | 5308 |
| 31 | 13153 |
| 32 | -3657 |
| 33 | -24655 |
| 34 | -4188 |
| 35 | 41465 |
| 36 | 25186 |
| 37 | -61932 |
| 38 | -70839 |
| 39 | 78211 |
| 40 | 157957 |
| 41 | -69304 |
| 42 | -307007 |
| 43 | -10442 |
| 44 | 534268 |