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 | 2 |
| 1 | -4 |
| 2 | 8 |
| 3 | -12 |
| 4 | 20 |
| 5 | -44 |
| 6 | 52 |
| 7 | -76 |
| 8 | 136 |
| 9 | -164 |
| 10 | 252 |
| 11 | -396 |
| 12 | 482 |
| 13 | -684 |
| 14 | 990 |
| 15 | -1272 |
| 16 | 1748 |
| 17 | -2388 |
| 18 | 3038 |
| 19 | -4020 |
| 20 | 5358 |
| 21 | -6796 |
| 22 | 8820 |
| 23 | -11448 |
| 24 | 14334 |
| 25 | -18304 |
| 26 | 23320 |
| 27 | -28940 |
| 28 | 36444 |
| 29 | -45708 |
| 30 | 56340 |
| 31 | -70056 |
| 32 | 86698 |
| 33 | -106056 |
| 34 | 130400 |
| 35 | -159852 |
| 36 | 194166 |
| 37 | -236452 |
| 38 | 287272 |
| 39 | -346544 |
| 40 | 418746 |
| 41 | -504800 |
| 42 | 604946 |
| 43 | -725756 |
| 44 | 868892 |
| 45 | -1035456 |
| 46 | 1234410 |
| 47 | -1468436 |
| 48 | 1740602 |
| 49 | -2063076 |
| 50 | 2440838 |
| 51 | -2879056 |
| 52 | 3394228 |
| 53 | -3995400 |
| 54 | 4690976 |