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 | 0 |
| 2 | -1 |
| 3 | 0 |
| 4 | -3 |
| 5 | 0 |
| 6 | -8 |
| 7 | 0 |
| 8 | -17 |
| 9 | 3 |
| 10 | -31 |
| 11 | 10 |
| 12 | -58 |
| 13 | 22 |
| 14 | -101 |
| 15 | 52 |
| 16 | -167 |
| 17 | 104 |
| 18 | -278 |
| 19 | 191 |
| 20 | -451 |
| 21 | 344 |
| 22 | -711 |
| 23 | 594 |
| 24 | -1119 |
| 25 | 983 |
| 26 | -1730 |
| 27 | 1606 |
| 28 | -2635 |
| 29 | 2555 |
| 30 | -3990 |
| 31 | 3978 |
| 32 | -5972 |
| 33 | 6118 |
| 34 | -8835 |
| 35 | 9269 |
| 36 | -12986 |
| 37 | 13835 |
| 38 | -18917 |
| 39 | 20454 |
| 40 | -27320 |
| 41 | 29900 |
| 42 | -39204 |
| 43 | 43268 |
| 44 | -55846 |
| 45 | 62112 |