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 | 1 |
| 3 | -1 |
| 4 | 3 |
| 5 | -3 |
| 6 | 2 |
| 7 | -5 |
| 8 | 9 |
| 9 | -8 |
| 10 | 9 |
| 11 | -19 |
| 12 | 26 |
| 13 | -25 |
| 14 | 37 |
| 15 | -64 |
| 16 | 77 |
| 17 | -87 |
| 18 | 138 |
| 19 | -205 |
| 20 | 241 |
| 21 | -312 |
| 22 | 481 |
| 23 | -651 |
| 24 | 794 |
| 25 | -1105 |
| 26 | 1613 |
| 27 | -2096 |
| 28 | 2693 |
| 29 | -3823 |
| 30 | 5322 |
| 31 | -6885 |
| 32 | 9209 |
| 33 | -12968 |
| 34 | 17529 |
| 35 | -22979 |
| 36 | 31386 |
| 37 | -43465 |
| 38 | 58037 |
| 39 | -77344 |
| 40 | 106237 |
| 41 | -144967 |
| 42 | 193418 |
| 43 | -260925 |
| 44 | 357441 |