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 | -3 |
| 3 | -2 |
| 4 | 1 |
| 5 | 10 |
| 6 | 13 |
| 7 | 15 |
| 8 | -1 |
| 9 | -30 |
| 10 | -63 |
| 11 | -89 |
| 12 | -80 |
| 13 | -14 |
| 14 | 131 |
| 15 | 304 |
| 16 | 493 |
| 17 | 561 |
| 18 | 434 |
| 19 | -32 |
| 20 | -836 |
| 21 | -1895 |
| 22 | -2960 |
| 23 | -3583 |
| 24 | -3240 |
| 25 | -1338 |
| 26 | 2401 |
| 27 | 8004 |
| 28 | 14499 |
| 29 | 20494 |
| 30 | 23369 |
| 31 | 20401 |
| 32 | 8567 |
| 33 | -13741 |
| 34 | -46408 |
| 35 | -85717 |
| 36 | -124027 |
| 37 | -149612 |
| 38 | -147167 |
| 39 | -101002 |
| 40 | 2520 |
| 41 | 168026 |
| 42 | 388077 |
| 43 | 634914 |