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 | 1 |
| 2 | 4 |
| 3 | -2 |
| 4 | -1 |
| 5 | 11 |
| 6 | -12 |
| 7 | 3 |
| 8 | 1 |
| 9 | 29 |
| 10 | -44 |
| 11 | 24 |
| 12 | -4 |
| 13 | -1 |
| 14 | 76 |
| 15 | -145 |
| 16 | 110 |
| 17 | -40 |
| 18 | 5 |
| 19 | 1 |
| 20 | 199 |
| 21 | -456 |
| 22 | 435 |
| 23 | -220 |
| 24 | 60 |
| 25 | -6 |
| 26 | -1 |
| 27 | 521 |
| 28 | -1393 |
| 29 | 1596 |
| 30 | -1015 |
| 31 | 385 |
| 32 | -84 |
| 33 | 7 |
| 34 | 1 |
| 35 | 1364 |
| 36 | -4168 |
| 37 | 5572 |
| 38 | -4256 |
| 39 | 2030 |
| 40 | -616 |
| 41 | 112 |
| 42 | -8 |
| 43 | -1 |
| 44 | 3571 |
| 45 | -12276 |
| 46 | 18756 |
| 47 | -16716 |
| 48 | 9576 |
| 49 | -3654 |
| 50 | 924 |
| 51 | -144 |