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 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 0 |
| 6 | 0 |
| 7 | 3 |
| 8 | 1 |
| 9 | -2 |
| 10 | 3 |
| 11 | 4 |
| 12 | -4 |
| 13 | 0 |
| 14 | 9 |
| 15 | -3 |
| 16 | -8 |
| 17 | 13 |
| 18 | 6 |
| 19 | -20 |
| 20 | 8 |
| 21 | 27 |
| 22 | -27 |
| 23 | -18 |
| 24 | 55 |
| 25 | -8 |
| 26 | -72 |
| 27 | 64 |
| 28 | 65 |
| 29 | -135 |
| 30 | 0 |
| 31 | 201 |
| 32 | -134 |
| 33 | -200 |
| 34 | 336 |
| 35 | 67 |
| 36 | -535 |
| 37 | 270 |
| 38 | 603 |
| 39 | -804 |
| 40 | -332 |
| 41 | 1408 |
| 42 | -471 |
| 43 | -1739 |
| 44 | 1880 |
| 45 | 1269 |
| 46 | -3618 |
| 47 | 612 |
| 48 | 4888 |
| 49 | -4229 |
| 50 | -4275 |
| 51 | 9118 |
| 52 | 47 |
| 53 | -13392 |
| 54 | 9072 |
| 55 | 13440 |
| 56 | -22463 |
| 57 | -4367 |
| 58 | 35904 |
| 59 | -18095 |
| 60 | -40270 |