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 | -3 |
| 3 | 4 |
| 4 | -4 |
| 5 | 6 |
| 6 | -11 |
| 7 | 14 |
| 8 | -15 |
| 9 | 22 |
| 10 | -31 |
| 11 | 34 |
| 12 | -41 |
| 13 | 56 |
| 14 | -69 |
| 15 | 82 |
| 16 | -98 |
| 17 | 120 |
| 18 | -152 |
| 19 | 178 |
| 20 | -204 |
| 21 | 254 |
| 22 | -308 |
| 23 | 354 |
| 24 | -415 |
| 25 | 496 |
| 26 | -587 |
| 27 | 680 |
| 28 | -785 |
| 29 | 922 |
| 30 | -1084 |
| 31 | 1248 |
| 32 | -1427 |
| 33 | 1664 |
| 34 | -1935 |
| 35 | 2202 |
| 36 | -2517 |
| 37 | 2906 |
| 38 | -3336 |
| 39 | 3798 |
| 40 | -4315 |
| 41 | 4930 |
| 42 | -5636 |
| 43 | 6380 |
| 44 | -7202 |
| 45 | 8194 |
| 46 | -9305 |
| 47 | 10474 |
| 48 | -11801 |
| 49 | 13342 |
| 50 | -15050 |