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 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | -1 |
| 5 | -2 |
| 6 | 2 |
| 7 | 1 |
| 8 | -4 |
| 9 | 3 |
| 10 | 6 |
| 11 | -10 |
| 12 | -3 |
| 13 | 19 |
| 14 | -12 |
| 15 | -24 |
| 16 | 43 |
| 17 | 8 |
| 18 | -83 |
| 19 | 56 |
| 20 | 100 |
| 21 | -187 |
| 22 | -21 |
| 23 | 354 |
| 24 | -262 |
| 25 | -411 |
| 26 | 820 |
| 27 | 39 |
| 28 | -1506 |
| 29 | 1210 |
| 30 | 1673 |
| 31 | -3593 |
| 32 | 56 |
| 33 | 6400 |
| 34 | -5545 |
| 35 | -6768 |
| 36 | 15705 |
| 37 | -1216 |
| 38 | -27144 |
| 39 | 25273 |
| 40 | 27207 |
| 41 | -68490 |
| 42 | 9442 |
| 43 | 114857 |
| 44 | -114644 |
| 45 | -108565 |
| 46 | 298054 |
| 47 | -58738 |
| 48 | -484827 |
| 49 | 517803 |
| 50 | 429452 |
| 51 | -1294392 |
| 52 | 330499 |