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 | 2 |
| 4 | -4 |
| 5 | 4 |
| 6 | -7 |
| 7 | 4 |
| 8 | -5 |
| 9 | 0 |
| 10 | 5 |
| 11 | -18 |
| 12 | 23 |
| 13 | -46 |
| 14 | 65 |
| 15 | -82 |
| 16 | 108 |
| 17 | -132 |
| 18 | 152 |
| 19 | -164 |
| 20 | 168 |
| 21 | -144 |
| 22 | 132 |
| 23 | -48 |
| 24 | -39 |
| 25 | 212 |
| 26 | -365 |
| 27 | 658 |
| 28 | -947 |
| 29 | 1382 |
| 30 | -1800 |
| 31 | 2394 |
| 32 | -2947 |
| 33 | 3644 |
| 34 | -4289 |
| 35 | 5102 |
| 36 | -5687 |
| 37 | 6392 |
| 38 | -6820 |
| 39 | 7112 |
| 40 | -7139 |
| 41 | 6776 |
| 42 | -5836 |
| 43 | 4338 |
| 44 | -2036 |
| 45 | -1342 |
| 46 | 5585 |
| 47 | -11392 |
| 48 | 18513 |
| 49 | -27456 |
| 50 | 37876 |
| 51 | -51072 |
| 52 | 65488 |
| 53 | -82982 |
| 54 | 101898 |