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 | 1 |
| 2 | -1 |
| 3 | 9 |
| 4 | -12 |
| 5 | 20 |
| 6 | -12 |
| 7 | 35 |
| 8 | -60 |
| 9 | 72 |
| 10 | -30 |
| 11 | 77 |
| 12 | -132 |
| 13 | 104 |
| 14 | -56 |
| 15 | 210 |
| 16 | -256 |
| 17 | 170 |
| 18 | -117 |
| 19 | 209 |
| 20 | -320 |
| 21 | 378 |
| 22 | -132 |
| 23 | 299 |
| 24 | -672 |
| 25 | 425 |
| 26 | -182 |
| 27 | 594 |
| 28 | -588 |
| 29 | 464 |
| 30 | -360 |
| 31 | 527 |
| 32 | -1040 |
| 33 | 858 |
| 34 | -306 |
| 35 | 910 |
| 36 | -1224 |
| 37 | 740 |
| 38 | -380 |
| 39 | 1170 |
| 40 | -1640 |
| 41 | 902 |
| 42 | -672 |
| 43 | 989 |
| 44 | -1364 |
| 45 | 1890 |
| 46 | -552 |
| 47 | 1175 |
| 48 | -2928 |
| 49 | 1470 |
| 50 | -775 |
| 51 | 1938 |
| 52 | -1872 |
| 53 | 1484 |
| 54 | -1080 |
| 55 | 2090 |