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 | 0 |
| 3 | 3 |
| 4 | -1 |
| 5 | -5 |
| 6 | 4 |
| 7 | 7 |
| 8 | -10 |
| 9 | -8 |
| 10 | 21 |
| 11 | 5 |
| 12 | -39 |
| 13 | 8 |
| 14 | 65 |
| 15 | -42 |
| 16 | -96 |
| 17 | 115 |
| 18 | 119 |
| 19 | -253 |
| 20 | -100 |
| 21 | 487 |
| 22 | -34 |
| 23 | -840 |
| 24 | 421 |
| 25 | 1293 |
| 26 | -1295 |
| 27 | -1712 |
| 28 | 3009 |
| 29 | 1710 |
| 30 | -6016 |
| 31 | -413 |
| 32 | 10735 |
| 33 | -3893 |
| 34 | -17164 |
| 35 | 14215 |
| 36 | 24006 |
| 37 | -35272 |
| 38 | -26955 |
| 39 | 73493 |
| 40 | 15689 |
| 41 | -135720 |
| 42 | 30849 |
| 43 | 224902 |
| 44 | -150880 |
| 45 | -329773 |
| 46 | 406631 |
| 47 | 403795 |
| 48 | -887284 |
| 49 | -326937 |