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) |
|---|---|
| 1 | 1 |
| 2 | -1 |
| 3 | 1 |
| 4 | 3 |
| 5 | -4 |
| 6 | 5 |
| 7 | -6 |
| 8 | 3 |
| 9 | 10 |
| 10 | -16 |
| 11 | 23 |
| 12 | -27 |
| 13 | 14 |
| 14 | 6 |
| 15 | -34 |
| 16 | 83 |
| 17 | -101 |
| 18 | 86 |
| 19 | -37 |
| 20 | -72 |
| 21 | 204 |
| 22 | -309 |
| 23 | 346 |
| 24 | -243 |
| 25 | -29 |
| 26 | 454 |
| 27 | -908 |
| 28 | 1214 |
| 29 | -1130 |
| 30 | 470 |
| 31 | 776 |
| 32 | -2413 |
| 33 | 3884 |
| 34 | -4421 |
| 35 | 3244 |
| 36 | 162 |
| 37 | -5438 |
| 38 | 11285 |
| 39 | -15352 |
| 40 | 14688 |
| 41 | -6887 |
| 42 | -8640 |
| 43 | 29241 |
| 44 | -48353 |
| 45 | 56270 |
| 46 | -42850 |
| 47 | 1834 |